string changes in m211

A few changes, mostly in comments.

string changes in m210

There are 14 pot-files added, some are relevant, some not. See also issue 76550 and issue 76551. More than 20 existing po-files are touched too, mostly comment changes. You need to fix fuzzy strings to see main menu labels translated in next build.

String changes in SRC_m208

One string is added in sw module and two added and one changed in svx module. A lot of fixes and changes in most helpcontent2 subdirectories (some hundreds).