This adds an additional layer of defense.
Potential attack:
- "English" gets added as a language on the crowdin project
- (this can only be done by a moderator or the crowdin devs)
- malicious strings get added on crowdin as English translations
- we don't notice and pull the updates into the locale git submodule
- users with the "default" lang option selected who have their OS lang set to English
- and users with "English" explicitly selected in Electrum
- would see the malicious strings
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