Merge branch 'lilypond/translation' of ssh://jomand@git.sv.gnu.org/srv/git/lilypond

* 'lilypond/translation' of ssh://jomand@git.sv.gnu.org/srv/git/lilypond:
  Urgency xrefs fix
  Update of fretted strings
  Missing section
  Update of Percussion
  Partial update of Changing Defaults
  partial update of text, fixes doc build
  Fix wrong menu
  Updated Spanish PO
  Update of expressive
  Update of tutorial