fix selection detection of colornotes plugin
fix warning, unused variable
fix #32166
Merge pull request #1276 from heuchi/heuchi-fixColornotesPlugin

fix selection detection of colornotes plugin
Add translations to notenames plugin

moving it into a folder of it own for this.

Remove superfluos generation of .pro files during realease step, they
are generated in the lupdate step and only used there.

Add a single file containing all supported locales and simply the
build/gen-*-projectfile* scripts to use this single source
Note 1: there's a difference in gen-qt-procectfile* v.s the others in
additionaly having an *_en.ts file
Note 2: in the bat files a hardcoded "..\" is used to find the locale
file whereas in the Shell-scripts `basename $0` is used. Is there such a
thing for .bat files too?
Note 3: the .bat files have been tested, the shell-scripts have not been
tested, although they should work.
Esp. the nested `cmd ... \`cmd ...\` ...` needs testing, using
$(cmd ... $(cmd ...) ...) would be much nicer, but is not available in
plain Bourne Shell

Adjust share/locale/Readme.md to above changes