fix #36746, link to handbook 2.0
remove unused stack-down action. Added here but never implemented http://sourceforge.net/p/mscore/code/4066/
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.
change "AUTO" to "Automatic" in measure properties

and also capitalize the other entries in that popup
fix #36291: consolidate popup menus for line types

and fix capitalization
fix QComboBox items' capitalization in Debugger
fix QComboBox items' capitalization in Inspector
fix some more QComboBox items' capitalization

in UI files and
for note head names, where they get set programatically.
Also change Xcircle to XCircle.
fix toolTips to use Sentence case
Merge pull request #1383 from Jojo-Schmitz/thickness

fix #36656: width (of lines) vs. thickness
Merge pull request #1362 from Jojo-Schmitz/pre-translation

some text improvments, consolidations and capitalization fixes