Please provide the english language strings for Torbutton under "en-US" and not "en" as it is now

We ship "en-US" bundles, yet the language strings are under "en" in Torbutton. That leads to hacks like the one igt0 tried in #25013 (moved). We should fix the root cause here, though, which is that the language strings should be located under "en-US" given that there is no standalone Torbutton and there are no "en" bundles we distribute

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