Prompt users to restart after changing language

It sounds like Tor Browser needs to restart before certain Tor-specific strings will get reloaded. We should prompt the user to do so whenever they change language, otherwise the translation is incomplete.

It seems like Firefox already has a prompt we can co-opt that appears when you switch from a LTR ↔ RTL language, I believe.

Show screenshot:

Edited Nov 01, 2022 by donuts

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