Respect group integrity when removing stuff from the Undo stack.

Fixes: #9079
de.po: update
Bibtopic requires styles files to be passed via argument

Fixes: #9060
Do not spellcheck "code" in logical markup module
Typo
Update it.po
Update it.po
Fix failure to detect quoted flex insets in conversion to layout
48. Also, simplify this code.
(cherry picked from commit 7e1541dd49c4c85fb43f6ff72b6f2e7f4efb5c9a)