Giving a 1-star review without first trying to ask a question or open a bug isn't really nice, is it?
This is someone's free work that you're thrashing carelessly.

Hiding promoted tweets should work in any language.

Some features don't work when the site is used in any other than English. This is a limitation described here: https://github.com/oslego/better-twitter/issues/3

If something doesn't work, please be a good citizen and file a bug: https://github.com/oslego/better-twitter/