fix #29341, at least partial

but I think an update to/from Transifex is needed to make it work
another fix for #29341, selectionfilter
singular vs. plural
fix #23515
fix #29246: unrecognized chords with symbols imported with markup
update tests
Merge pull request #1117 from Jojo-Schmitz/translation

fix #29341, missing translations, more work
Merge pull request #1118 from MarcSabatella/29246-chord-symbol-markup

fix #29246: unrecognized chords with symbols imported with markup
The screen-reader will now also tell the menu's default shorcut keys,
when it is selected.

For example instead of "File" it will now say "File Alt+F".