GitHub Actions / misspell should ignore translations

**Short description**: GitHub Actions / misspell should not check localised content in, for example, `_18n/pt_BR`, to avoid it failing over that content.

**URL**: https://github.com/AntennaPod/antennapod.github.io/pull/469/checks?check_run_id=62953994428

**More info**: GitHub Actions / misspell currently also checks localised content in, for example, `_18n/pt_BR`. It finds 'errors' and therefore fails.

It looks like the exclude rule is not respected:

https://github.com/AntennaPod/antennapod.github.io/blob/2e6bce879179e1186220ed17338399408f4470f1/.github/workflows/autoreview.yml#L14