Erros and translations

Hi, lads!

I'm having a few issues with this plug in.

First: can't make the translated mo file works... the language inj the wp-config is set to es_ES for spanish... I've tried this different combinations for renaming the plugin mo file, but none of theme works:

Buy the way, in the po file couldn't find the string for translate "sigin with twitter" and "signin with facebook"


All ready configure the settings and introduce the api keys and secrets of facebook and twitter, but when I push the sing in with button, errors apears.

In facebook:

and in twitter says that there are no token... the url I'm using is the one sugested by the plugin