It is annoying to see posts in languages you don't understand.
Therefore it would be nice to be able to filter out those posts in foreign languages.
For this a selection of understandable languages could be implemented as an option for each user.
The language filter could be implemented considering post length and link content.
The language detection could be implemented considering the n most frequent words in each language and countig their occurence in each post.
For example like that:
duplicate of #3513