Add grip to modify hairpin aperture
several fixes for translations
simplifying translation by joining multi part strings

Correcting some apparent errors and adding some missing translations in
the due course
'untranslate' some strings from the debugger
adding/removing colons in some dialogs

and making insert measure dialog similar to append measures dialog
a couple more colons added/removed from some dialogs
untranslate yet another string from debugger
fix warning due to duplicate name
Add proportional grip aperture positionning whane hairpin is small
Merge pull request #744 from Jojo-Schmitz/orig-texts

Some more fixes for translation
Merge pull request #722 from Gai-Luron/aperture-grip

Add grip to modify hairpin aperture
fix #17487
fix wrong case in ui files
Merge pull request #750 from lvinken/musicxml-fixes

fix #17487