implement language as state instead of cookie

[notmd]

close #1365 close #1662 close #1692 close #1530

• Detect language from URL instead of cookie.

Steps to verify this.

• In tab 1, choose a task in language en.
• Open tab 2, change the language to a different one, and complete 1 task.
• Back to tab 1 to finish the pending task. Verify that the next task and the UI are still in English.

This change is really critical, so be careful when deploying to production, better to test it in staging with our community first

[notmd]

Pre-commit failure is not related to my change

[AbdBarho]

Thank you, hopefully we can close this problem once and for all.

[AbdBarho]

other than the eslint rule, it looks good!

I cannot merge because of the pre-commit, we are gonna have to wait for it to be fixed on main, or someone with "admin" rights to force merge.