In Settings --> Language --> you select an external .xml language file (for example Catalan.xml, due that catalan it's not included in the standard package) --> Save --> Close App --> Run App --> And 'et voilą' it appears in spanish (that in my case is the system default language and Espanol is avaliable in the standard package).

So, what happened with the translations added in .xml ? Are they out of order from now?