Looking to add Spanish Audio and/or Subtitles - is there a plugin?

[Gotta]

Hey guys, my current library is setup for English - but i have a lot of spanish friends and family, so was considering adding Spanish Audio/Subtitles to my movies.
Is there a plugin that can pickup the Spanish audio? ( or is this something that needs to be done while downloading it ) ; or plugin to add in spanish subtitles?

thanks!