The calendar lables are already listening to the language selection established in “My Settings” (Look under Personal – Language and Time Zones).

We have implemented Spanish and French translations for all our labels.

Here is what the calendar looks like for a user that has selected Spanish.

If you want to add additional traslations - you can add values to custom lables. Set up a list view for the skuid namespace and you will see all our custom lables.

Hello,
thank you for your answer. I would like to translate it into anothe language.

I do not really know how to do it could you show me some small example?

Best regards
Pawel

If you want to add additional traslations - you can add values to custom lables.  Set up a list view for the skuid namespace and you will see all our custom lables. 

This all starts at  Salesforce Setup - Create - Custom Labels