I have got error message when translating templates like following: Attention! Your PHP configuration limits the number of fields in the form of post 1000 max_input_vars. Please ask your hosting provider to increase this limit to at least xxxx, or you will have to edit the translation files
You can fix this issue when you increase default value of max_input_vars.
e.g via .htaccess
php_value max_input_vars 2000
More methods can be checked by following link