Problem with language change

[diblos]

I have dell venue pro with wp 7.8 installed. Default language is english, whenever i change language to any other than default, some funcions doesnt work properly, for example i cant write or read sms, when i tap on sms jst nothing happens. Someone had this problem before? Changing region setting does not help. I need fast reply if possible

 

[DBDev]

If you don't get any other advice you could try a hard reset, but it will delete all data on your phone