Form errors translation

I have translated the fields of the form on Russian but the errors are still showing up on English. I have checked the .po files and those error messages are translated fine. Maybe I need to set the language of the form somehow to get Russian errors showing up?

Another translation question – the Rusian abbreviation (two letters) for days of week at the top of the calendar are not usual, can I fix them?

Please update to the latest easyreservations.org/beta. If I remember correctley a bug in the error messages translation got fixed. Update your russian translation with the easyreservations.pot from the beta as well.
Regards