Feature summary (what you would like to be able to do and where):
When subscribing to new posts in Diff, I should be able to select my preferred language(s) and my emails should be filtered based on that.

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
This reduces unwanted email of translations when users cannot read that language.

Benefits (why should this be implemented?):
Also reduces work for the email server and may decrease unsubscribe rates.