Can you provide some details?
On the language:
- Is SuiteCRM working when using the english language?
- When (actions/Step to reproduce) did you get that error on language?
- How did you installed the language? (see tutorial in my signature)
- Did you get the latest language pack version from Crowdin (v. 7.8.2.4)
https://crowdin.com/project/suitecrmtranslations/
On your system:
- System, PHP, MySQL versions ?
- Is it a fresh install from SuiteCRM version 7.8.2 ?