fix #30471
fix translation of some accessibility infos

fix translation of some accessibility infos:
* accidentals
* articulations
* clefs
* jumps  (need to run thru Transifex first to be seen)
* keysigs
* marker (need to run thru Transifex first to be seen)
* noteheadnames (not shown anywhere currently)
* tremolo
* trills (need to run thru Transifex first to be seen)

fix some capitalization issues
more steam ('-j 4') for mtest on Travis

better fail quick than due to having reached a Travis limit