If you get an error similar to this one while translating language files, it means that you made an error in the language file and you will need to correct it.
The error will give you the line number where the error is. If you have a text editor that can show line numbers, then check that line position.
Some things you should check:
1. Check that the line ends in semicolon sign (;)
2. Check that the translated string is enclosed in quotes.