Month names text in date field

Hi all!

Joomla 1.5 with Spanish translation, CB 1.7.1 with Spanish translation.

I'm developing a Spanish front-end website. I have a date field in the CB Profile. When I register a user in the front-end in my computer website, the names of the months are shown in Spanish, but when I upload the website to the hosting (using Akeeba Backup, so same configuration), the names are in English.

Maybe it's something similiar to topic #166042, but no one has replied to it.

¿Any idea?

I've tried with two different hosting and same effect.
The problem is the calendar-local.js in the language pluging. It works well in my computer, but it seems that when I upload the website to the hosting, the calendar-local.js in the default folder is used instead of the Spanish one.
I copied the Spanish one to the default folder and it worked.