MID-2587 adding missing localization keys

gui/admin-gui/src/main/resources/localization/Midpoint.properties

@@ -1107,6 +1107,8 @@ pageAdminFocus.subTitle.editOrgType=organization '{0}'
 pageAdminFocus.subTitle.newOrgType=new organization
 pageAdminFocus.title.editFocusType=Edit
 pageAdminFocus.title.newFocusType=Create
+pageAdminFocus.message.cantEditFocus=Unknown error occurred, can't edit focus object.
+pageAdminFocus.message.cantNewFocus=Unknown error occurred, can't create new focus object.
 pageAdminFocus.message.illegalAccountState=Illegal shadow state '{0}'.
 pageAdminFocus.message.illegalAccountState=Illegal assignment state '{0}'.
 pageAdminFocus.message.noAssignmentsAvailable=There are currently no assignments to preview.
@@ -1443,6 +1445,9 @@ PageDebugView.subTitle=for '{0}'
 pageDebugView.switchToPlainText=Switch to plain text
 PageDebugView.title=Object details
 pageDebugView.validateSchema=Validate schema
+PageError403.title=Forbidden
+PageError404.title=Not found
+PageError401.title=Unauthorized
 PageError.button.back=Back to dashboard
 PageError.error.401=unauthorized (401)
 PageError.error.403=forbidden (403)
@@ -1451,7 +1456,7 @@ PageError.error.500=internal error (500)
 PageError.message=Unexpected error occurred, if necessary please contact system administrator.
 PageError.quoteAuthor=Henry Ford
 PageError.quote=Failure is simply the opportunity to begin again, this time more intelligently.
-PageError.title=Error
+PageError.title=Internal error
 PageFindUsers.subTitle=in midPoint
 PageFindUsers.title=Find users
 PageForgetPassword.email=E-mail