Filter podcasts by language

### What problem does this address?

Is it possible to develop the feature which filter Podcasts by language of Podcasts contents ?

### What is your proposed solution?

My proposed solutions are:
- Add parameters to Api requests if they support
or
- Request All Podcasts as normal, then ignore unrelated Podcasts

### Did you search for existing feature suggestions?

- [X] I have searched for existing feature suggestions.

No files, tests, or entry points are named. Start by locating how podcasts are fetched and filtered, then determine whether the API supports language parameters or whether filtering must happen locally. Done means the product can reliably show podcasts filtered by content language, with the behavior verified by appropriate tests.

Written by the indexing model from the issue text.