Updated spanish version form release 2346

Hi!

I leave here a new mscore_es.ts file with updates. However, the problem described on http://www.musescore.org/en/node/3432, about english strings displayed instead of translated language persists. I made an svn update, and I resolved carefuly the conflicts wich appear on the mscore_es.ts. I've notized that only some strings where added or changed.

It's a good idea to keep translating the program, or should I wait until this problem it's fixed?