Can I also localize the URLs?

For example, on my site this one opens tags: https://www.sorujokeri.com/tags
But in Turkish tags means Etiketler and a native user will expect the url as: https://www.sorujokeri.com/etiketler

Can I do that without breaking anything?

After doing this and fixing a few more translation errors from past developers (translations) I will put flarum in production. Thanks!

https://github.com/flarum/flarum-ext-tags
There are quite a few mentions of /tags
Maybe try replacing all those /tags to /etiketler

Also check out other localization's for other languages and modify?

Hope it helps smoky ?