[stable8] chore: sync translations from master branch

[susnux]

☑️ Resolves

mkdir merged-entries
for f in stable8/l10n/*.pot; do
    [ "$f" = "messages.pot" ] && continue
    msgcat -o "merged-entries/$(basename $f)" --use-first "main/l10n/$(basename $f)" "$f"
done

# update the stable one with all needed translations
for f in merged-entries/*.pot; do
    msgmerge -N "$f" "stable8/l10n/messages.pot" > "stable8/l10n/$(basename $f)"
done

see also #7247 - not that many active translations thus best to check with German for success of this operation.