[BUGFIX] Fix typos in PHPDoc, rst file and template

Fixes following typos:
- Replace 'ite_language' with 'site_language' in SiteTcaInline
- Replace 'langauges' with 'languages' in rst file
- Replace 'sytem' with 'system' in CreateAdmin template

Resolves: #88948
Releases: master, 9.5
Change-Id: Iaca4ad7eb7647508e3de66004c288efe84be4b0b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61486
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: Susanne Moog <look@susi.dev>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Susanne Moog <look@susi.dev>

typo3/sysext/backend/Classes/Form/FormDataProvider/SiteTcaInline.php

@@ -146,7 +146,7 @@ protected function resolveSiteRelatedChildren(array $result, string $fieldName):
             }
         }
 
-        // If we are dealing with ite_language, we *always* force a relation to sys_language "0"
+        // If we are dealing with site_language, we *always* force a relation to sys_language "0"
         if ($foreignTable === 'site_language' && $result['command'] === 'edit') {
             // If edit, find out if a child using sys_language "0" exists, else add it on top
             $defaultSysSiteLanguageChildFound = false;

typo3/sysext/core/Documentation/Changelog/7.4/Feature-68191-TypoScriptSelectOptionLanguageFieldIsActiveByDefault.rst

@@ -10,7 +10,7 @@ See :issue:`68191`
 Description
 ===========
 
-The TypoScript .select option which is used for Content Objects like "CONTENT", has the property "languageField". This option allows to set the name of the database field that has the information about the sys_language_uid value in order to have only records shown that are translated or set to "-1" (show in all langauges) when showing translated pages.
+The TypoScript .select option which is used for Content Objects like "CONTENT", has the property "languageField". This option allows to set the name of the database field that has the information about the sys_language_uid value in order to have only records shown that are translated or set to "-1" (show in all languages) when showing translated pages.
 
 Previously this functionality had to be set explicitly:
 

typo3/sysext/install/Resources/Private/Templates/Maintenance/CreateAdmin.html

@@ -47,7 +47,7 @@
                     <input
                         class="t3-install-form-input-checkbox t3js-createAdmin-system-maintainer"
                         type="checkbox"
-                        id="add-as-sytem-maintainer"
+                        id="add-as-system-maintainer"
                     />
                     Add as system maintainer
                 </label>