Improvement for compound meter count-in

Compound-meter-like time signatures (3*n/d where n > 1) are NOT counter as compound meters (one beat every 3 d units) but as 'triplets' of 'click'-'clack'-'clack' if:

1) the denominator is 1/4 or longer

2) the tempo for the compound unit would be slower then 60MM
Names shown in tooltips for items of the note-head palette are obscure glyph tags.

This patch uses symbol "user names" (SymbolNames::mname) instead of SymbolNames::name for the note-head palette items.
fixes for input state
Merge pull request #518 from mgavioli/PALETTE_user-friendly_names_for_notehead_palette

Use user-friendly names for items in the note-head palette
Merge pull request #511 from mgavioli/count_in_fine_tuning

Improvement for compound meter count-in
load most recent translation instead of user one by default
fix ambiguous calls
fix #23338 (2nd try)
fix #23350
fixes for editing multi measure rests
fix #23358
enable audio again
fix #23355
fix playback of multi measure rests
fix X on hairpin
Fix #22167: graces in TAB's collide with main chord.

Fixed and also improved grace stem length for TAB with stems beside staff.
fix #23366

At least a first batch
Merge pull request #523 from Jojo-Schmitz/fix.orig.texts

fix #23366
Merge pull request #522 from mgavioli/Fix_22167_TAB_graces_collide

Fix #22167: graces in TAB's collide with main chord.
fix #23369

Adds support for "/" within chordnames if the portion after the "/" is
not convertible to tpc and hence not a valid bass note.  This allows for
C6/9 to be rendered as such.  I look at the *last* slash when deciding
how to proceed, so C6/9/E is handled correctly.