lilypond: replace texlive package requires with "tex:" ones (#7376)
lilypond: replace texlive package requires with "tex:" ones (#7376)

Also improve summaries of doc packages. For the language names, a similar technique to python
packages is used.
haikuports/haikuports,Begasus/haikuports,haikuports/haikuports,haikuports/haikuports,Begasus/haikuports,Begasus/haikuports,Begasus/haikuports,haikuports/haikuports,Begasus/haikuports,haikuports/haikuports