Problem:
As in the title, user wants to configure QA language specific settings.
As an example I will present situation in which it might be useful: for French QA flags spaces before colons or semicolons (and some other punctuation) as an error, while in French this is normal (even mandatory).
Solution:
You can add a new QA profiles for specific target language:
Choose French as target language:
This profile will be available for all French jobs by default.