fix #24491: don't enable even header in dialog

when that dialog is disabled. Same for even footer, should the score
have that set to disabled.
Also give nicer names to some labels.
fix translation issue
Merge pull request #767 from Jojo-Schmitz/24491-header-footer-even-odd-setting

fix #24491: don't enable even header in dialog
remove unstyled text
fix regression: insert title
update vtest
add vtest for slurs
fix cursor height in dynamics
smoother icons on retina display
implement text property change for selected subtext
implement restyling of text