Add contexts to instrument and instrument_description entries in the pot files, where there's a comment.
Don't contextualize descriptions, that doesn't help anything.
Also actually translate instrument names with comments in code.
Fix Last.fm URL cleanup
Merge remote-tracking branch 'nikki-bitbucket/urlcleanup-lastfm' into beta

* nikki-bitbucket/urlcleanup-lastfm:
  Fix Last.fm URL cleanup
Merge branch 'instrument-context' into beta

* instrument-context:
  Also actually translate instrument names with comments in code.
  Don't contextualize descriptions, that doesn't help anything.
  Add contexts to instrument and instrument_description entries in the pot files, where there's a comment.