Breaking: #84148 - RequireJS module for language handling removed 

See forge#84148

Description 

Since the removal of ExtJS, the JavaScript files that handled the localization of labels in backend modules became obsolete and have been removed.

Impact 

Depending on the RequireJS module TYPO3/CMS/Lang/Lang will result in 404 errors, as the module has been removed.

Affected Installations 

Every 3rd party extension depending on TYPO3/CMS/Lang/Lang is affected.

Migration 

Remove the module from the affected RequireJS modules. The labels are now prepared by the PageRenderer and passed to TYPO3.lang without the need of additional JavaScript.