When no prefix is detected, the app is used as before (cookie or accept). It leverages the nextjs's default locale called default.

When prefix is detected, it forces the selected language and sets cookie.

This could

• help Google to discover other language versions
• and also users could use it link specific version like osmapp.org/cs/node/123 (not that useful)

Alternative urls:

• osmapp.org/cs/node/123
• osmapp.org/node/123/en
• osmapp.org/node/123?lang=cs
• cs.osmapp.org/node/123 <- not sure how to do on vercel

Questions:

• no prefix = english OR autodetect?
• use prefix/query only as setter&remove OR leave it in app consistently