Collation issue with comm + Spanish translation updates

Hi Remy.

I found a problem when upgrading from AUR using pacaur 4.1.2.

When `foreignpkgs` is been calculated with `comm`, it uses the system's LC_COLLATE ("es_AR.UTF-8" in my case) instead of C, giving some warnings about the files not been properly sorted. Commit #9c7f01f fix this issue.

I also took a moment to review the Spanish translation and I edited my name in the README (technically, my last name is "Osella Massa" ;-). All this is in commit #f4b259a.

Keep up the good work!
Germán