Sync translation/messages.json with static/index.html

#14 (closed) updated the bug-reporting instructions in static/index.html, but the strings in translations/messages.json were not updated to match. This means that every translation (including the English version) at https://snowflake.torproject.org/#bugs is still showing the old bug-reporting instructions.

I assume that updating translations/messages.json will cause translators to get a notice that they need to update their translations, but I don't know how to start that process.