Date not displaying in Spanish anymore

[Aranzamendi]

I installed a module, minifrontpage module, and since, I noticed that my dates (created and modified) which happened to be in Spanish, are now back to English. I unistalled Spanish, and installed it again, and published it, and made it default, and set country locale to es_ES@euro, like before, but date remains in English.

How can I solve this problem? My main site language is Spanish. I had to hide date features, for I was not able to solve the problem.

Can anyone help me get them back to Spanish??