Swapped "spa" langcode definition so "Spanish" is displayed instead of "Castilian" when changing the subtitle language. Castilian is an alternative name to Spanish http://www.loc.gov/standards/iso639-2/php/code_list.php
Merge pull request #4417 from joethefox/swap_spa_langcode

Swap "spa" langcode definition line so "Spanish" is displayed instead of "Castilian"....