[BUGFIX] Remove language section from base CKEditor config

If the language section is configured it prevents the backend
from applying the current backend user locale to the CKEditor
UI.

Resolves: #100633
Releases: main, 12.4
Change-Id: I61903e00787e6772a39fc84f0ae39c40deb78d3b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/79213


Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>

typo3/sysext/rte_ckeditor/Configuration/RTE/Editor/Base.yaml

@@ -5,10 +5,5 @@ editor:
     # the CSS file to be used inside the editor
     contentsCss:
       - 'EXT:rte_ckeditor/Resources/Public/Css/contents.css'
-    language:
-      # will be overridden by the locale of the backend user
-      ui: 'en'
-      # will be overridden by the record (if a language is set)
-      content: 'en'
     height: 300
     width: 'auto'