[TASK] Add warning and link to WIKI in all write actions

Also includes some improvements in the generated Templates

Resolves: #57686
Releases: 6.2

Change-Id: I5407ca3676790b93947390d458994e98d9a61fd4
Reviewed-on: https://review.typo3.org/29208
Reviewed-by: Nico de Haen
Tested-by: Nico de Haen