fix #36656: width (of lines) vs. thickness

and consolidate volta "Continue height".
Also change "Fix" to "Fixed" to make clearer it is an adjective, not a
noun or verb.
And make "Numbers only" Sentence style.
Get rid of unneeded abbreviations "Visib." and "Link."
Change "Early music" to Sentence case.
Merge pull request #1383 from Jojo-Schmitz/thickness

fix #36656: width (of lines) vs. thickness