diff --git a/src/components/forms/EditHardwareGroupForm/EditHardwareGroupForm.js b/src/components/forms/EditHardwareGroupForm/EditHardwareGroupForm.js
index 928ea62d4..56e7c68bc 100644
--- a/src/components/forms/EditHardwareGroupForm/EditHardwareGroupForm.js
+++ b/src/components/forms/EditHardwareGroupForm/EditHardwareGroupForm.js
@@ -3,7 +3,8 @@ import PropTypes from 'prop-types';
 import { FormattedMessage } from 'react-intl';
 import { reduxForm, Field } from 'redux-form';
 import { Alert } from 'react-bootstrap';
-import isInt from 'validator/lib/isInt';
+import Icon from 'react-fontawesome';
+
 import FormBox from '../../widgets/FormBox';
 import SubmitButton from '../SubmitButton';
 import Button from '../../widgets/FlatButton';
@@ -72,6 +73,14 @@ const EditHardwareGroupForm = ({
       </div>
     }
   >
+    <p className="text-muted text-justify small">
+      <Icon name="info-circle" />&nbsp;&nbsp;
+      <FormattedMessage
+        id="app.editHardwareGroupForm.about"
+        defaultMessage="Hardware group is a group of backend workers on which the exercise can be evaluated. The workers are bound to explicit hardware; thus, changing the hardware group of an exercise may affect the performance results. Furthermore, the workers in the group share configuration which implies the constraints for memory and time limits."
+      />
+    </p>
+
     {submitFailed &&
       <Alert bsStyle="danger">
         <FormattedMessage
@@ -107,16 +116,17 @@ EditHardwareGroupForm.propTypes = {
   invalid: PropTypes.bool,
   reset: PropTypes.func.isRequired,
   hardwareGroups: PropTypes.array.isRequired,
-  addEmptyOption: PropTypes.bool
+  addEmptyOption: PropTypes.bool,
+  warnDropLimits: PropTypes.func.isRequired
 };
 
-const validate = ({ bonusPoints }) => {
+const validate = ({ hardwareGroup }) => {
   const errors = {};
-  if (!isInt(String(bonusPoints))) {
-    errors['bonusPoints'] = (
+  if (!hardwareGroup) {
+    errors['hardwareGroup'] = (
       <FormattedMessage
-        id="app.bonusPointsForm.validation.points"
-        defaultMessage="The bonus must be an integer."
+        id="app.editHardwareGroupForm.validationFailed"
+        defaultMessage="Hardware group must be selected."
       />
     );
   }
@@ -124,9 +134,23 @@ const validate = ({ bonusPoints }) => {
   return errors;
 };
 
+const warn = ({ hardwareGroup }, { warnDropLimits }) => {
+  const warnings = {};
+  if (warnDropLimits(hardwareGroup)) {
+    warnings['hardwareGroup'] = (
+      <FormattedMessage
+        id="app.editHardwareGroupForm.warnLimitsDrop"
+        defaultMessage="Limits of some environments do not meet the constraints of the selected hardware group. These limits will be removed when the hardware group is changed."
+      />
+    );
+  }
+  return warnings;
+};
+
 export default reduxForm({
   form: 'editHardwareGroup',
   enableReinitialize: true,
   keepDirtyOnReinitialize: false,
-  validate
+  validate,
+  warn
 })(EditHardwareGroupForm);
diff --git a/src/locales/cs.json b/src/locales/cs.json
index d3133c15b..53cb47dbf 100644
--- a/src/locales/cs.json
+++ b/src/locales/cs.json
@@ -138,22 +138,12 @@
   "app.confirm.no": "Ne",
   "app.confirm.yes": "Ano",
   "app.createGroup.externalId": "Externí identifikátor skupiny (například  ID ze školního informačního systému):",
-  "app.createGroup.groupDescription": "Description:",
-  "app.createGroup.groupName": "Name:",
   "app.createGroup.hasThreshold": "Studenti potřebují určitý počet bodů pro splnění kurzu",
   "app.createGroup.isPublic": "Veřejná (skupinu vidí všichni uživatelé a můžou se do ní přidat)",
   "app.createGroup.publicStats": "Studenti mohou vidět dosažené body ostatních",
   "app.createGroup.threshold": "Minimální procentuální hranice potřebná ke splnění tohoto kurzu:",
-  "app.createGroup.validation.emptyDescription": "Group description cannot be empty.",
-  "app.createGroup.validation.emptyName": "Group name cannot be empty.",
-  "app.createGroup.validation.nameCollision": "The name \"{name}\" is already used, please choose a different one.",
   "app.createGroup.validation.thresholdBetweenZeroHundred": "Procentuální hranice musí být celé číslo od 0 do 100.",
   "app.createGroup.validation.thresholdMustBeInteger": "Procentuální hranice musí být celé číslo.",
-  "app.createGroupForm.createGroup": "Create new group",
-  "app.createGroupForm.failed": "We are sorry but we weren't able to create a new group.",
-  "app.createGroupForm.processing": "Group is being created ...",
-  "app.createGroupForm.success": "Group has been created",
-  "app.createGroupForm.title": "Create new group",
   "app.createGroupForm.validation.noLocalizedText": "Please add at least one localized text describing the group.",
   "app.dashboard.sisGroupsStudent": "SIS Courses - Student",
   "app.dashboard.sisGroupsStudentExplain": "SIS courses you are enrolled to in particular semesters and which have correspondig groups in ReCodEx.",
@@ -162,14 +152,10 @@
   "app.dashboard.studentOf": "Skupiny kde jste studentem",
   "app.dashboard.supervisorOf": "Skupiny kde jste cvičícím",
   "app.deleteButton.confirm": "Opravdu toto chcete smazat? Tato operace nemůže být vrácena.",
-  "app.deleteButton.delete": "Delete",
-  "app.deleteButton.deleted": "Deleted.",
-  "app.deleteButton.deleting": "Deleting failed",
   "app.editAssignment.deleteAssignment": "Smazat zadání úlohy",
   "app.editAssignment.deleteAssignmentWarning": "Smazání zadané úlohy odstraní všechna studentská řešní. Pro případné obnovení těchto dat prosím kontaktujte správce ReCodExu.",
   "app.editAssignment.description": "Změnit nastavení zadání úlohy včetně jejích limitů",
   "app.editAssignment.title": "Upravit zadání úlohy",
-  "app.editAssignmentForm.addLanguage": "Add language variant",
   "app.editAssignmentForm.allowSecondDeadline": "Povolit druhý termín odevzdání.",
   "app.editAssignmentForm.canViewLimitRatios": "Viditelnost poměrů dosažených výsledků vůči limitům",
   "app.editAssignmentForm.chooseFirstDeadlineBeforeSecondDeadline": "Před nastavením druhého termínu odevzdání je nutné zvolit první termín.",
@@ -181,16 +167,9 @@
   "app.editAssignmentForm.localized.assignment": "Zadání úlohy a popis pro studenty:",
   "app.editAssignmentForm.localized.locale": "Jazyková mutace:",
   "app.editAssignmentForm.localized.name": "Name:",
-  "app.editAssignmentForm.localized.noLanguage": "There is currently no text in any language for this assignment.",
-  "app.editAssignmentForm.localized.reallyRemoveQuestion": "Do you really want to delete the assignmenet in this language?",
-  "app.editAssignmentForm.localized.remove": "Remove this language",
   "app.editAssignmentForm.maxPointsBeforeFirstDeadline": "Maximální počet bodů pro řešení odevzdaná před prvním termínem:",
   "app.editAssignmentForm.maxPointsBeforeSecondDeadline": "Maximální počet bodů pro řešení odevzdaná před druhým termínem:",
-  "app.editAssignmentForm.moreAboutScoreConfig": "Read more about <a href='https://github.com/ReCodEx/wiki/wiki/Assignments#scoring'>score configuration</a> syntax.",
-  "app.editAssignmentForm.name": "Assignment default name:",
-  "app.editAssignmentForm.newLocale": "New language",
   "app.editAssignmentForm.pointsPercentualThreshold": "Minimální procentuální správnost řešení, za kterou lze získat nějaké body:",
-  "app.editAssignmentForm.scoreConfig": "Score configuration:",
   "app.editAssignmentForm.secondDeadline": "Druhý termín odevzdání:",
   "app.editAssignmentForm.submissionsCountLimit": "Počet pokusů odevzdání:",
   "app.editAssignmentForm.submit": "Upravit nastavení",
@@ -237,23 +216,6 @@
   "app.editEnvironmentConfigVariables.stringArrayType": "Array of strings",
   "app.editEnvironmentConfigVariables.stringType": "Řetězec",
   "app.editEnvironmentConfigVariables.variables": "Proměnné:",
-  "app.editEnvironmentLimitsForm.box": "Box",
-  "app.editEnvironmentLimitsForm.environment.name": "Environment name:",
-  "app.editEnvironmentLimitsForm.environment.noEnvironment": "There is currently no environment specified for this assignment.",
-  "app.editEnvironmentLimitsForm.newEnvironment": "New environment",
-  "app.editEnvironmentLimitsForm.noBoxesForPipeline": "There are no boxes which need to set limits in this pipeline.",
-  "app.editEnvironmentLimitsForm.noPipelinesForTest": "There are no pipelines for this test to edit.",
-  "app.editEnvironmentLimitsForm.pipeline": "Pipeline",
-  "app.editEnvironmentLimitsForm.submit": "Save changes to {env}",
-  "app.editEnvironmentLimitsForm.submitting": "Saving changes ...",
-  "app.editEnvironmentLimitsForm.success": "Saved.",
-  "app.editEnvironmentLimitsForm.validating": "Validating...",
-  "app.editEnvironmentLimitsForm.validation.memory": "You must set the memory limit.",
-  "app.editEnvironmentLimitsForm.validation.memory.mustBePositive": "You must set the memory limit to a positive number.",
-  "app.editEnvironmentLimitsForm.validation.parallel": "You must set the limit for the number of parallel processes.",
-  "app.editEnvironmentLimitsForm.validation.parallel.mustBePositive": "You must set the limit for the number of parallel processes to a positive number.",
-  "app.editEnvironmentLimitsForm.validation.time": "You must set the time limit.",
-  "app.editEnvironmentLimitsForm.validation.time.mustBePositive": "You must set the time limit to a positive number.",
   "app.editEnvironmentSimpleForm.failed": "Uložení se nezdařilo. Prosíme opakujte akci později.",
   "app.editEnvironmentSimpleForm.reset": "Obnovit původní",
   "app.editEnvironmentSimpleForm.submit": "Uložit prostředí",
@@ -278,12 +240,10 @@
   "app.editExerciseConfigEnvironment.reallyRemoveQuestion": "Opravdu chcete smazat tuto konfiguraci prostředí?",
   "app.editExerciseConfigForm.addTest": "Přidat nový test",
   "app.editExerciseConfigForm.failed": "Uložení se nezdařilo. Prosíme opakujte akci později.",
-  "app.editExerciseConfigForm.fileType": "File",
   "app.editExerciseConfigForm.pipelines": "Pipeliny",
   "app.editExerciseConfigForm.removeLastTest": "Odstranit poslední test",
   "app.editExerciseConfigForm.smartFill": "Smart Fill",
   "app.editExerciseConfigForm.smartFill.yesNoQuestion": "Do you really wish to overwrite configuration of all subsequent tests using the first test as a template? Files will be paired to individual test configurations by a heuristics based on matching name substrings.",
-  "app.editExerciseConfigForm.stringType": "String",
   "app.editExerciseConfigForm.submit": "Změnit konfiguraci",
   "app.editExerciseConfigForm.submitting": "Ukládání konfigurace ...",
   "app.editExerciseConfigForm.success": "Konfigurace byla uložena.",
@@ -291,7 +251,6 @@
   "app.editExerciseConfigForm.validation.duplicatePipeline": "Please select a different pipeline.",
   "app.editExerciseConfigForm.validation.noEnvironments": "Please add at least one environment config for the exercise.",
   "app.editExerciseConfigForm.variables": "Proměnné",
-  "app.editExerciseForm.description": "Description for supervisors:",
   "app.editExerciseForm.difficulty": "Obtížnost",
   "app.editExerciseForm.easy": "Snadné",
   "app.editExerciseForm.failed": "Uložení se nezdařilo. Prosim, opakujte akci později.",
@@ -299,7 +258,6 @@
   "app.editExerciseForm.isLocked": "Úloha je zamčená (viditelná, ale není možné jí zadat v žádné skupině).",
   "app.editExerciseForm.isPublic": "Úloha je veřejná a může být použita cvičícími.",
   "app.editExerciseForm.medium": "Průměrné",
-  "app.editExerciseForm.name": "Exercise name:",
   "app.editExerciseForm.submit": "Upravit nastavení",
   "app.editExerciseForm.submitting": "Ukládání změn ...",
   "app.editExerciseForm.success": "Nastavení bylo uloženo.",
@@ -320,24 +278,6 @@
   "app.editExerciseLimits.multiHwGroups": "The exercise uses complex configuration of multiple hardware groups. Editting the limits using this form may simplify this configuration. Proceed at your own risk.",
   "app.editExerciseLimits.multiHwGroupsTitle": "Multiple hardware groups detected",
   "app.editExerciseLimits.title": "Změnit limity testů",
-  "app.editExerciseLimitsForm.failed": "Saving failed. Please try again later.",
-  "app.editExerciseLimitsForm.submit": "Change limits",
-  "app.editExerciseLimitsForm.submitting": "Saving limits ...",
-  "app.editExerciseLimitsForm.success": "Limits were saved.",
-  "app.editExerciseLimitsForm.validation.envName": "Please fill environment name.",
-  "app.editExerciseLimitsForm.validation.memoryIsNotNumer": "Memory limit must be an integer.",
-  "app.editExerciseLimitsForm.validation.memoryLimit": "Memory limit must be a positive integer.",
-  "app.editExerciseLimitsForm.validation.timeIsNotNumer": "Time limit must be a real number.",
-  "app.editExerciseLimitsForm.validation.timeLimit": "Time limit must be a positive real number.",
-  "app.editExerciseLimitsForm.validation.useDotDecimalSeparator": "Please use a dot as a decimal separator instead of the comma.",
-  "app.editExerciseRuntimeConfigsForm.failed": "Saving failed. Please try again later.",
-  "app.editExerciseRuntimeConfigsForm.submit": "Change runtime configurations",
-  "app.editExerciseRuntimeConfigsForm.submitting": "Saving runtime configurations ...",
-  "app.editExerciseRuntimeConfigsForm.success": "Runtime configurations were saved.",
-  "app.editExerciseRuntimeConfigsForm.validation.empty": "Please fill the runtime environment information.",
-  "app.editExerciseRuntimeConfigsForm.validation.jobConfig": "Please fill the job configuration of the runtime environment.",
-  "app.editExerciseRuntimeConfigsForm.validation.name": "Please fill the display name of the runtime environment.",
-  "app.editExerciseRuntimeConfigsForm.validation.runtimeEnvironmentId": "Please select a runtime environment.",
   "app.editExerciseSimpleConfig.noTests": "There are no tests yet. The form cannot be displayed until at least one test is created.",
   "app.editExerciseSimpleConfigForm.reset": "Obnovit původní",
   "app.editExerciseSimpleConfigForm.submit": "Uložit konfiguraci",
@@ -378,7 +318,6 @@
   "app.editGroupForm.set": "Upravit skupinu",
   "app.editGroupForm.success": "Nastavení skupiny bylo uloženo.",
   "app.editGroupForm.successNew": "Create group",
-  "app.editGroupForm.title": "Edit group",
   "app.editGroupForm.titleEdit": "Edit group",
   "app.editGroupForm.titleNew": "Create new group",
   "app.editGroupForm.validation.emptyName": "Please fill the name of the group.",
@@ -386,9 +325,12 @@
   "app.editGroupForm.validation.localizedText.locale": "Please select the language.",
   "app.editGroupForm.validation.localizedText.text": "Please fill the description in this language.",
   "app.editGroupForm.validation.sameLocalizedTexts": "There are more language variants with the same locale. Please make sure locales are unique.",
-  "app.editHardwareGroupForm.failed": "Cannot change the hardware group of the exercise.",
-  "app.editHardwareGroupForm.hwGroupSelect": "Hardware Group:",
-  "app.editHardwareGroupForm.title": "Select Hardware Group",
+  "app.editHardwareGroupForm.about": "Hardwarová skupina definuje workery vyhodnocovacího backendu, na kterých může být úloha vyhodnocena. Tato skupina workerů je svázána s konkrétním hardware a její změna může ovlivnit naměřené výkonostní hodnoty testovaných řešení. Hardwarová skupina také sdílí konfiguraci, ze které vyplývají omezení pro paměťové a časové limity.",
+  "app.editHardwareGroupForm.failed": "Nepodařilo se změnit hardwarovou skupinu úlohy.",
+  "app.editHardwareGroupForm.hwGroupSelect": "Hardwarová skupina:",
+  "app.editHardwareGroupForm.title": "Výběr hardwarové skupiny",
+  "app.editHardwareGroupForm.validationFailed": "Hardwarová skupina musí být vybrána.",
+  "app.editHardwareGroupForm.warnLimitsDrop": "Limity některých běhových prostředí neodpovídají omezením vybrané hardwarové skupiny. Tyto limity budou při změně skupiny odstraněny.",
   "app.editInstance.description": "Změnit nastavení instance",
   "app.editInstance.title": "Upravit instanci",
   "app.editInstanceForm.description": "Popis:",
@@ -436,14 +378,6 @@
   "app.editPipelineForm.validation.description": "Prosíme vyplňte popis této pipeliny.",
   "app.editPipelineForm.validation.emptyName": "Prosíme vyplňte název této pipeliny.",
   "app.editPipelineForm.validation.versionDiffers": "Někdo jiný změnit nastavení této pipeliny v průběhu vaší editace. Prosíme znovu načtěte tuto stránku a aplikujte své změny znovu.",
-  "app.editRuntimeConfigForm.addConfigTab": "Add new runtime configuration",
-  "app.editRuntimeConfigForm.configName": "Name of Configuration:",
-  "app.editRuntimeConfigForm.emptyConfigTabs": "There is currently no runtime configuration.",
-  "app.editRuntimeConfigForm.jobConfig": "Job Configuration:",
-  "app.editRuntimeConfigForm.moreAboutJobConfig": "Read more about <a href='https://github.com/ReCodEx/wiki/wiki/Job-configuration' target='_blank'>job configuration</a> syntax.",
-  "app.editRuntimeConfigForm.newConfig": "New configuration",
-  "app.editRuntimeConfigForm.reallyRemoveQuestion": "Do you really want to delete this runtime configuration?",
-  "app.editRuntimeConfigForm.runtimeEnvironment": "Select runtime environment:",
   "app.editScoreConfigForm.failed": "Saving failed. Please try again later.",
   "app.editScoreConfigForm.scoreConfig": "Score configuration:",
   "app.editScoreConfigForm.submit": "Change configuration",
@@ -491,8 +425,6 @@
   "app.editUserProfile.validation.emptyFirstName": "Jméno nemůže být prázdné.",
   "app.editUserProfile.validation.emptyLastName": "Příjmení nemůže být prázdné.",
   "app.editUserProfile.validation.emptyNewPassword": "Nové heslo nemůže být prázdné pokud si měníte heslo.",
-  "app.editUserProfile.validation.emptyOldPassword": "Old password cannot be empty if you want to change your password.",
-  "app.editUserProfile.validation.passwordTooWeak": "The password you chose is too weak, please choose a different one.",
   "app.editUserProfile.validation.passwordsDontMatch": "Hesla se neshodují.",
   "app.editUserProfile.validation.samePasswords": "Změnit Vaše heslo na stejné nedává žádný smysl.",
   "app.editUserProfile.validation.shortFirstName": "First name must contain at least 2 characters.",
@@ -738,10 +670,6 @@
   "app.filesTable.title": "Attached files",
   "app.footer.copyright": "Copyright © 2016-2018 <a href=\"{website}\">ReCodEx</a>.</strong> Všechna práva vyhrazena.",
   "app.footer.version": "<strong>Verze</strong> {version}",
-  "app.forkExerciseButton.confirmation": "Do you really want to fork this exercise?",
-  "app.forkExerciseButton.failed": "Try forking the exercise again",
-  "app.forkExerciseButton.fork": "Fork the exercise",
-  "app.forkExerciseButton.loading": "Forking ...",
   "app.forkExerciseButton.success": "Show the forked exercise",
   "app.forkExerciseForm.failed": "Saving failed. Please try again later.",
   "app.forkExerciseForm.submit": "Fork exercise",
@@ -785,10 +713,6 @@
   "app.groups.removeGroupAdminButton": "Remove group admin",
   "app.groups.removeSupervisorButton": "Odebrat cvičícího",
   "app.groupsName.loading": "Načítání ...",
-  "app.hardwareGroupFields.memoryLimit": "Memory limit for \"{taskId}\":",
-  "app.hardwareGroupFields.noReferenceSolutions": "There are no reference solutions' evaluations' for test '{testName}' and its task '{taskId}'.",
-  "app.hardwareGroupFields.test": "Test:",
-  "app.hardwareGroupFields.timeLimit": "Time limit for \"{taskId}\":",
   "app.hardwareGroupMetadata.cpuTimeOverlay": "Precise (CPU) time limit constraints",
   "app.hardwareGroupMetadata.description": "Internal Description:",
   "app.hardwareGroupMetadata.id": "Internal Identifier:",
@@ -940,12 +864,6 @@
   "app.pipelineEditor.BoxForm.success": "Saved",
   "app.pipelineEditor.BoxForm.type": "Type:",
   "app.pipelineEditor.EditBoxForm.title": "Edit the box '{name}'",
-  "app.pipelineEditor.addBoxForm.add": "Add",
-  "app.pipelineEditor.addBoxForm.emptyName": "Name cannot be empty.",
-  "app.pipelineEditor.addBoxForm.name": "Box name",
-  "app.pipelineEditor.addBoxForm.portsIn": "Inputs",
-  "app.pipelineEditor.addBoxForm.portsOut": "Outputs",
-  "app.pipelineEditor.addBoxForm.title": "Add a box",
   "app.pipelineFilesTable.description": "Supplementary files are files which can be referenced as remote file in pipeline configuration.",
   "app.pipelineFilesTable.title": "Supplementary files",
   "app.pipelineVisualEditor.addBoxButton": "Add box",
@@ -1014,12 +932,6 @@
   "app.referenceSolutionDetail.title.details": "Detail referenčního řešení",
   "app.referenceSolutionDetail.uploadedAt": "Nahráno:",
   "app.referenceSolutionEvaluation.title": "Evaluations of reference solution",
-  "app.referenceSolutionEvaluation.titlePrefix": "Evaluations for runtime:",
-  "app.referenceSolutionsEvaluations.description": "Description",
-  "app.referenceSolutionsEvaluations.evaluatedAt": "Evaluated on",
-  "app.referenceSolutionsEvaluations.memory": "Memory",
-  "app.referenceSolutionsEvaluations.time": "Time",
-  "app.referenceSolutionsEvaluations.title": "Reference solutions' evaluations",
   "app.registration.description": "Začněte dnes používat ReCodEx",
   "app.registration.title": "Vytvořte si nový účet v ReCodExu",
   "app.registrationForm.createAccount": "Vytvořit účet",
@@ -1040,7 +952,6 @@
   "app.registrationForm.validation.emptyLastName": "Příjmení nemůže být prázdné.",
   "app.registrationForm.validation.emptyPassword": "Heslo nemůže být prázdné.",
   "app.registrationForm.validation.passwordDontMatch": "Passwords don't match.",
-  "app.registrationForm.validation.passwordTooWeak": "The password you chose is too weak, please choose a different one.",
   "app.registrationForm.validation.shortFirstName": "First name must contain at least 2 characters.",
   "app.registrationForm.validation.shortLastName": "Last name must contain at least 2 characters.",
   "app.removeFromGroup.confirm": "Are you sure you want to remove the user from this group?",
diff --git a/src/locales/en.json b/src/locales/en.json
index bafb9cf86..da2347b51 100644
--- a/src/locales/en.json
+++ b/src/locales/en.json
@@ -138,22 +138,12 @@
   "app.confirm.no": "No",
   "app.confirm.yes": "Yes",
   "app.createGroup.externalId": "External ID of the group (e. g. ID of the group in the school IS):",
-  "app.createGroup.groupDescription": "Description:",
-  "app.createGroup.groupName": "Name:",
   "app.createGroup.hasThreshold": "Students require cetrain number of points to complete the course",
   "app.createGroup.isPublic": "Public (everyone can see and join this group)",
   "app.createGroup.publicStats": "Students can see statistics of each other",
   "app.createGroup.threshold": "Minimum percent of the total points count needed to complete the course:",
-  "app.createGroup.validation.emptyDescription": "Group description cannot be empty.",
-  "app.createGroup.validation.emptyName": "Group name cannot be empty.",
-  "app.createGroup.validation.nameCollision": "The name \"{name}\" is already used, please choose a different one.",
   "app.createGroup.validation.thresholdBetweenZeroHundred": "Threshold must be an integer in between 0 and 100.",
   "app.createGroup.validation.thresholdMustBeInteger": "Threshold must be an integer.",
-  "app.createGroupForm.createGroup": "Create new group",
-  "app.createGroupForm.failed": "We are sorry but we weren't able to create a new group.",
-  "app.createGroupForm.processing": "Group is being created ...",
-  "app.createGroupForm.success": "Group has been created",
-  "app.createGroupForm.title": "Create new group",
   "app.createGroupForm.validation.noLocalizedText": "Please add at least one localized text describing the group.",
   "app.dashboard.sisGroupsStudent": "SIS Courses - Student",
   "app.dashboard.sisGroupsStudentExplain": "SIS courses you are enrolled to in particular semesters and which have correspondig groups in ReCodEx.",
@@ -162,14 +152,10 @@
   "app.dashboard.studentOf": "Groups you are student of",
   "app.dashboard.supervisorOf": "Groups you supervise",
   "app.deleteButton.confirm": "Are you sure you want to delete the resource? This cannot be undone.",
-  "app.deleteButton.delete": "Delete",
-  "app.deleteButton.deleted": "Deleted.",
-  "app.deleteButton.deleting": "Deleting failed",
   "app.editAssignment.deleteAssignment": "Delete the assignment",
   "app.editAssignment.deleteAssignmentWarning": "Deleting an assignment will remove all the students submissions and you will have to contact the administrator of ReCodEx if you wanted to restore the assignment in the future.",
   "app.editAssignment.description": "Change assignment settings and limits",
   "app.editAssignment.title": "Edit assignment settings",
-  "app.editAssignmentForm.addLanguage": "Add language variant",
   "app.editAssignmentForm.allowSecondDeadline": "Allow second deadline.",
   "app.editAssignmentForm.canViewLimitRatios": "Visibility of memory and time ratios",
   "app.editAssignmentForm.chooseFirstDeadlineBeforeSecondDeadline": "You must select the date of the first deadline before selecting the date of the second deadline.",
@@ -181,16 +167,9 @@
   "app.editAssignmentForm.localized.assignment": "Description for the students:",
   "app.editAssignmentForm.localized.locale": "The language:",
   "app.editAssignmentForm.localized.name": "Name:",
-  "app.editAssignmentForm.localized.noLanguage": "There is currently no text in any language for this assignment.",
-  "app.editAssignmentForm.localized.reallyRemoveQuestion": "Do you really want to delete the assignmenet in this language?",
-  "app.editAssignmentForm.localized.remove": "Remove this language",
   "app.editAssignmentForm.maxPointsBeforeFirstDeadline": "Maximum amount of points received when submitted before the deadline:",
   "app.editAssignmentForm.maxPointsBeforeSecondDeadline": "Maximum amount of points received when submitted before the second deadline:",
-  "app.editAssignmentForm.moreAboutScoreConfig": "Read more about <a href='https://github.com/ReCodEx/wiki/wiki/Assignments#scoring'>score configuration</a> syntax.",
-  "app.editAssignmentForm.name": "Assignment default name:",
-  "app.editAssignmentForm.newLocale": "New language",
   "app.editAssignmentForm.pointsPercentualThreshold": "Minimum percentage of points which submissions have to gain:",
-  "app.editAssignmentForm.scoreConfig": "Score configuration:",
   "app.editAssignmentForm.secondDeadline": "Second deadline:",
   "app.editAssignmentForm.submissionsCountLimit": "Submissions count limit:",
   "app.editAssignmentForm.submit": "Edit settings",
@@ -237,23 +216,6 @@
   "app.editEnvironmentConfigVariables.stringArrayType": "Array of strings",
   "app.editEnvironmentConfigVariables.stringType": "String",
   "app.editEnvironmentConfigVariables.variables": "Variables:",
-  "app.editEnvironmentLimitsForm.box": "Box",
-  "app.editEnvironmentLimitsForm.environment.name": "Environment name:",
-  "app.editEnvironmentLimitsForm.environment.noEnvironment": "There is currently no environment specified for this assignment.",
-  "app.editEnvironmentLimitsForm.newEnvironment": "New environment",
-  "app.editEnvironmentLimitsForm.noBoxesForPipeline": "There are no boxes which need to set limits in this pipeline.",
-  "app.editEnvironmentLimitsForm.noPipelinesForTest": "There are no pipelines for this test to edit.",
-  "app.editEnvironmentLimitsForm.pipeline": "Pipeline",
-  "app.editEnvironmentLimitsForm.submit": "Save changes to {env}",
-  "app.editEnvironmentLimitsForm.submitting": "Saving changes ...",
-  "app.editEnvironmentLimitsForm.success": "Saved.",
-  "app.editEnvironmentLimitsForm.validating": "Validating...",
-  "app.editEnvironmentLimitsForm.validation.memory": "You must set the memory limit.",
-  "app.editEnvironmentLimitsForm.validation.memory.mustBePositive": "You must set the memory limit to a positive number.",
-  "app.editEnvironmentLimitsForm.validation.parallel": "You must set the limit for the number of parallel processes.",
-  "app.editEnvironmentLimitsForm.validation.parallel.mustBePositive": "You must set the limit for the number of parallel processes to a positive number.",
-  "app.editEnvironmentLimitsForm.validation.time": "You must set the time limit.",
-  "app.editEnvironmentLimitsForm.validation.time.mustBePositive": "You must set the time limit to a positive number.",
   "app.editEnvironmentSimpleForm.failed": "Saving failed. Please try again later.",
   "app.editEnvironmentSimpleForm.reset": "Reset",
   "app.editEnvironmentSimpleForm.submit": "Save Environments",
@@ -278,12 +240,10 @@
   "app.editExerciseConfigEnvironment.reallyRemoveQuestion": "Do you really want to delete this runtime configuration?",
   "app.editExerciseConfigForm.addTest": "Add new test",
   "app.editExerciseConfigForm.failed": "Saving failed. Please try again later.",
-  "app.editExerciseConfigForm.fileType": "File",
   "app.editExerciseConfigForm.pipelines": "Pipelines",
   "app.editExerciseConfigForm.removeLastTest": "Remove last test",
   "app.editExerciseConfigForm.smartFill": "Smart Fill",
   "app.editExerciseConfigForm.smartFill.yesNoQuestion": "Do you really wish to overwrite configuration of all subsequent tests using the first test as a template? Files will be paired to individual test configurations by a heuristics based on matching name substrings.",
-  "app.editExerciseConfigForm.stringType": "String",
   "app.editExerciseConfigForm.submit": "Change configuration",
   "app.editExerciseConfigForm.submitting": "Saving configuration ...",
   "app.editExerciseConfigForm.success": "Configuration was changed.",
@@ -291,7 +251,6 @@
   "app.editExerciseConfigForm.validation.duplicatePipeline": "Please select a different pipeline.",
   "app.editExerciseConfigForm.validation.noEnvironments": "Please add at least one environment config for the exercise.",
   "app.editExerciseConfigForm.variables": "Variables",
-  "app.editExerciseForm.description": "Description for supervisors:",
   "app.editExerciseForm.difficulty": "Difficulty",
   "app.editExerciseForm.easy": "Easy",
   "app.editExerciseForm.failed": "Saving failed. Please try again later.",
@@ -299,7 +258,6 @@
   "app.editExerciseForm.isLocked": "Exercise is locked (visible, but cannot be assigned to any group).",
   "app.editExerciseForm.isPublic": "Exercise is public and can be assigned to students by their supervisors.",
   "app.editExerciseForm.medium": "Medium",
-  "app.editExerciseForm.name": "Exercise name:",
   "app.editExerciseForm.submit": "Edit settings",
   "app.editExerciseForm.submitting": "Saving changes ...",
   "app.editExerciseForm.success": "Settings were saved.",
@@ -320,24 +278,6 @@
   "app.editExerciseLimits.multiHwGroups": "The exercise uses complex configuration of multiple hardware groups. Editting the limits using this form may simplify this configuration. Proceed at your own risk.",
   "app.editExerciseLimits.multiHwGroupsTitle": "Multiple hardware groups detected",
   "app.editExerciseLimits.title": "Edit tests limits",
-  "app.editExerciseLimitsForm.failed": "Saving failed. Please try again later.",
-  "app.editExerciseLimitsForm.submit": "Change limits",
-  "app.editExerciseLimitsForm.submitting": "Saving limits ...",
-  "app.editExerciseLimitsForm.success": "Limits were saved.",
-  "app.editExerciseLimitsForm.validation.envName": "Please fill environment name.",
-  "app.editExerciseLimitsForm.validation.memoryIsNotNumer": "Memory limit must be an integer.",
-  "app.editExerciseLimitsForm.validation.memoryLimit": "Memory limit must be a positive integer.",
-  "app.editExerciseLimitsForm.validation.timeIsNotNumer": "Time limit must be a real number.",
-  "app.editExerciseLimitsForm.validation.timeLimit": "Time limit must be a positive real number.",
-  "app.editExerciseLimitsForm.validation.useDotDecimalSeparator": "Please use a dot as a decimal separator instead of the comma.",
-  "app.editExerciseRuntimeConfigsForm.failed": "Saving failed. Please try again later.",
-  "app.editExerciseRuntimeConfigsForm.submit": "Change runtime configurations",
-  "app.editExerciseRuntimeConfigsForm.submitting": "Saving runtime configurations ...",
-  "app.editExerciseRuntimeConfigsForm.success": "Runtime configurations were saved.",
-  "app.editExerciseRuntimeConfigsForm.validation.empty": "Please fill the runtime environment information.",
-  "app.editExerciseRuntimeConfigsForm.validation.jobConfig": "Please fill the job configuration of the runtime environment.",
-  "app.editExerciseRuntimeConfigsForm.validation.name": "Please fill the display name of the runtime environment.",
-  "app.editExerciseRuntimeConfigsForm.validation.runtimeEnvironmentId": "Please select a runtime environment.",
   "app.editExerciseSimpleConfig.noTests": "There are no tests yet. The form cannot be displayed until at least one test is created.",
   "app.editExerciseSimpleConfigForm.reset": "Reset",
   "app.editExerciseSimpleConfigForm.submit": "Save Configuration",
@@ -378,7 +318,6 @@
   "app.editGroupForm.set": "Edit group",
   "app.editGroupForm.success": "Group settings was saved.",
   "app.editGroupForm.successNew": "Create group",
-  "app.editGroupForm.title": "Edit group",
   "app.editGroupForm.titleEdit": "Edit group",
   "app.editGroupForm.titleNew": "Create new group",
   "app.editGroupForm.validation.emptyName": "Please fill the name of the group.",
@@ -386,9 +325,12 @@
   "app.editGroupForm.validation.localizedText.locale": "Please select the language.",
   "app.editGroupForm.validation.localizedText.text": "Please fill the description in this language.",
   "app.editGroupForm.validation.sameLocalizedTexts": "There are more language variants with the same locale. Please make sure locales are unique.",
+  "app.editHardwareGroupForm.about": "Hardware group is a group of backend workers on which the exercise can be evaluated. The workers are bound to explicit hardware; thus, changing the hardware group of an exercise may affect the performance results. Furthermore, the workers in the group share configuration which implies the constraints for memory and time limits.",
   "app.editHardwareGroupForm.failed": "Cannot change the hardware group of the exercise.",
   "app.editHardwareGroupForm.hwGroupSelect": "Hardware Group:",
   "app.editHardwareGroupForm.title": "Select Hardware Group",
+  "app.editHardwareGroupForm.validationFailed": "Hardware group must be selected.",
+  "app.editHardwareGroupForm.warnLimitsDrop": "Limits of some environments do not meet the constraints of the selected hardware group. These limits will be removed when the hardware group is changed.",
   "app.editInstance.description": "Change instance settings",
   "app.editInstance.title": "Edit instance",
   "app.editInstanceForm.description": "Description:",
@@ -436,14 +378,6 @@
   "app.editPipelineForm.validation.description": "Please fill the description of the pipeline.",
   "app.editPipelineForm.validation.emptyName": "Please fill the name of the pipeline.",
   "app.editPipelineForm.validation.versionDiffers": "Somebody has changed the pipeline while you have been editing it. Please reload the page and apply your changes once more.",
-  "app.editRuntimeConfigForm.addConfigTab": "Add new runtime configuration",
-  "app.editRuntimeConfigForm.configName": "Name of Configuration:",
-  "app.editRuntimeConfigForm.emptyConfigTabs": "There is currently no runtime configuration.",
-  "app.editRuntimeConfigForm.jobConfig": "Job Configuration:",
-  "app.editRuntimeConfigForm.moreAboutJobConfig": "Read more about <a href='https://github.com/ReCodEx/wiki/wiki/Job-configuration' target='_blank'>job configuration</a> syntax.",
-  "app.editRuntimeConfigForm.newConfig": "New configuration",
-  "app.editRuntimeConfigForm.reallyRemoveQuestion": "Do you really want to delete this runtime configuration?",
-  "app.editRuntimeConfigForm.runtimeEnvironment": "Select runtime environment:",
   "app.editScoreConfigForm.failed": "Saving failed. Please try again later.",
   "app.editScoreConfigForm.scoreConfig": "Score configuration:",
   "app.editScoreConfigForm.submit": "Change configuration",
@@ -491,8 +425,6 @@
   "app.editUserProfile.validation.emptyFirstName": "First name cannot be empty.",
   "app.editUserProfile.validation.emptyLastName": "Last name cannot be empty.",
   "app.editUserProfile.validation.emptyNewPassword": "New password cannot be empty if you want to change your password.",
-  "app.editUserProfile.validation.emptyOldPassword": "Old password cannot be empty if you want to change your password.",
-  "app.editUserProfile.validation.passwordTooWeak": "The password you chose is too weak, please choose a different one.",
   "app.editUserProfile.validation.passwordsDontMatch": "Passwords don't match.",
   "app.editUserProfile.validation.samePasswords": "Changing your password to the same password does not make any sense.",
   "app.editUserProfile.validation.shortFirstName": "First name must contain at least 2 characters.",
@@ -738,10 +670,6 @@
   "app.filesTable.title": "Attached files",
   "app.footer.copyright": "Copyright © 2016-2018 <a href=\"{website}\">ReCodEx</a>.</strong> All rights reserved.",
   "app.footer.version": "<strong>Version</strong> {version}",
-  "app.forkExerciseButton.confirmation": "Do you really want to fork this exercise?",
-  "app.forkExerciseButton.failed": "Try forking the exercise again",
-  "app.forkExerciseButton.fork": "Fork the exercise",
-  "app.forkExerciseButton.loading": "Forking ...",
   "app.forkExerciseButton.success": "Show the forked exercise",
   "app.forkExerciseForm.failed": "Saving failed. Please try again later.",
   "app.forkExerciseForm.submit": "Fork exercise",
@@ -785,10 +713,6 @@
   "app.groups.removeGroupAdminButton": "Remove group admin",
   "app.groups.removeSupervisorButton": "Remove supervisor",
   "app.groupsName.loading": "Loading ...",
-  "app.hardwareGroupFields.memoryLimit": "Memory limit for \"{taskId}\":",
-  "app.hardwareGroupFields.noReferenceSolutions": "There are no reference solutions' evaluations' for test '{testName}' and its task '{taskId}'.",
-  "app.hardwareGroupFields.test": "Test:",
-  "app.hardwareGroupFields.timeLimit": "Time limit for \"{taskId}\":",
   "app.hardwareGroupMetadata.cpuTimeOverlay": "Precise (CPU) time limit constraints",
   "app.hardwareGroupMetadata.description": "Internal Description:",
   "app.hardwareGroupMetadata.id": "Internal Identifier:",
@@ -940,12 +864,6 @@
   "app.pipelineEditor.BoxForm.success": "Saved",
   "app.pipelineEditor.BoxForm.type": "Type:",
   "app.pipelineEditor.EditBoxForm.title": "Edit the box '{name}'",
-  "app.pipelineEditor.addBoxForm.add": "Add",
-  "app.pipelineEditor.addBoxForm.emptyName": "Name cannot be empty.",
-  "app.pipelineEditor.addBoxForm.name": "Box name",
-  "app.pipelineEditor.addBoxForm.portsIn": "Inputs",
-  "app.pipelineEditor.addBoxForm.portsOut": "Outputs",
-  "app.pipelineEditor.addBoxForm.title": "Add a box",
   "app.pipelineFilesTable.description": "Supplementary files are files which can be referenced as remote file in pipeline configuration.",
   "app.pipelineFilesTable.title": "Supplementary files",
   "app.pipelineVisualEditor.addBoxButton": "Add box",
@@ -1014,12 +932,6 @@
   "app.referenceSolutionDetail.title.details": "Reference solution detail",
   "app.referenceSolutionDetail.uploadedAt": "Uploaded at:",
   "app.referenceSolutionEvaluation.title": "Evaluations of reference solution",
-  "app.referenceSolutionEvaluation.titlePrefix": "Evaluations for runtime:",
-  "app.referenceSolutionsEvaluations.description": "Description",
-  "app.referenceSolutionsEvaluations.evaluatedAt": "Evaluated on",
-  "app.referenceSolutionsEvaluations.memory": "Memory",
-  "app.referenceSolutionsEvaluations.time": "Time",
-  "app.referenceSolutionsEvaluations.title": "Reference solutions' evaluations",
   "app.registration.description": "Start using ReCodEx today",
   "app.registration.title": "Create a new ReCodEx account",
   "app.registrationForm.createAccount": "Create account",
@@ -1040,7 +952,6 @@
   "app.registrationForm.validation.emptyLastName": "Last name cannot be empty.",
   "app.registrationForm.validation.emptyPassword": "Password cannot be empty.",
   "app.registrationForm.validation.passwordDontMatch": "Passwords don't match.",
-  "app.registrationForm.validation.passwordTooWeak": "The password you chose is too weak, please choose a different one.",
   "app.registrationForm.validation.shortFirstName": "First name must contain at least 2 characters.",
   "app.registrationForm.validation.shortLastName": "Last name must contain at least 2 characters.",
   "app.removeFromGroup.confirm": "Are you sure you want to remove the user from this group?",
diff --git a/src/pages/EditExerciseLimits/EditExerciseLimits.js b/src/pages/EditExerciseLimits/EditExerciseLimits.js
index b3160fe13..394a1cf71 100644
--- a/src/pages/EditExerciseLimits/EditExerciseLimits.js
+++ b/src/pages/EditExerciseLimits/EditExerciseLimits.js
@@ -79,6 +79,83 @@ class EditExerciseLimits extends Component {
       dispatch(fetchExerciseTestsIfNeeded(exerciseId))
     ]);
 
+  doesHardwareGroupChangeDropLimits = defaultMemoize(
+    (
+      exerciseId,
+      currentHwGroupId,
+      limits,
+      tests,
+      exerciseRuntimeEnvironments,
+      hardwareGroups
+    ) => {
+      const limitsData =
+        currentHwGroupId &&
+        getLimitsInitValues(
+          limits,
+          tests,
+          exerciseRuntimeEnvironments,
+          exerciseId,
+          currentHwGroupId
+        );
+
+      return targetHwGroupId => {
+        if (!targetHwGroupId || targetHwGroupId === currentHwGroupId) {
+          return false;
+        }
+        const constraints = getLimitsConstraints(
+          hardwareGroups.filter(h => h.id === targetHwGroupId),
+          limitsData.preciseTime
+        );
+
+        return !transformLimitsValues(
+          limitsData,
+          tests,
+          exerciseRuntimeEnvironments
+        ).reduce(
+          (acc, { id: envId, data }) =>
+            acc &&
+            validateLimitsSingleEnvironment(limitsData, envId, constraints),
+          true
+        );
+      };
+      /*
+      setExerciseHardwareGroups(
+        formData.hardwareGroup ? [formData.hardwareGroup] : []
+      ).then(
+        ({ value: exercise }) =>
+          limitsData
+            ? Promise.all(
+                exercise.hardwareGroups.map(({ id: hwgId }, idx) => {
+                  const constraints = getLimitsConstraints(
+                    exercise.hardwareGroups,
+                    limitsData.preciseTime
+                  );
+                  return Promise.all(
+                    transformLimitsValues(
+                      limitsData,
+                      tests,
+                      exerciseRuntimeEnvironments
+                    ).map(
+                      ({ id: envId, data }) =>
+                        validateLimitsSingleEnvironment(
+                          limitsData,
+                          envId,
+                          constraints
+                        )
+                          ? editEnvironmentLimits(hwgId, envId, data)
+                          : idx === 0
+                            ? fetchExerciseEnvironmentLimit(envId, hwgId)
+                            : Promise.resolve()
+                    )
+                  );
+                })
+              )
+            : Promise.resolve()
+      );
+    */
+    }
+  );
+
   transformAndSendHardwareGroups = defaultMemoize(
     (exerciseId, hwGroupId, limits, tests, exerciseRuntimeEnvironments) => {
       const {
@@ -274,6 +351,15 @@ class EditExerciseLimits extends Component {
                         !exercise.hardwareGroups ||
                         exercise.hardwareGroups.length !== 1
                       }
+                      warnDropLimits={this.doesHardwareGroupChangeDropLimits(
+                        exercise.id,
+                        exercise.hardwareGroups &&
+                          exercise.hardwareGroups[0].id,
+                        limits,
+                        tests,
+                        exercise.runtimeEnvironments,
+                        hwgs
+                      )}
                       onSubmit={this.transformAndSendHardwareGroups(
                         exercise.id,
                         exercise.hardwareGroups &&