3 backports to do

main	13.4	12.4
Merged #87515 [BUGFIX] Update CKEditor model in source edit view on input Author Benjamin Franzke Updated 03/04/25, 18:48 Affected Files 2 Patchsets 10 Reviews 3 Verifies 3	Merged #88480 [BUGFIX] Update CKEditor model in source edit view on input 13.4 Author Benjamin Franzke Updated 03/04/25, 18:48 Affected Files 2 Patchsets 2 Reviews 2 Verifies 2	#90840 [BUGFIX] Update CKEditor model in source edit view on input 12.4 Author Andreas Kienast Updated 12/08/25, 23:17 Affected Files 2 Patchsets 2 Reviews Verifies
Merged #92240 [TASK] Update copyright year in README.md and INSTALL.md Author Benni Mack Updated 01/02/26, 17:56 Affected Files 2 Patchsets 2 Reviews 3 Verifies 3	Review is missing.	Review is missing.
Merged #92187 [TASK] Unify ViewHelper arguments naming Author Simon Praetorius Updated 01/15/26, 12:43 Affected Files 2 Patchsets 4 Reviews 6 Verifies 7	Review is missing.