How to change language interface in Mozilla Thunderbird
SOLUTION!
1. looking for language file (.xpi) sample https://download-installer.cdn.mozilla.net/pub/thunderbird/releases/60.5.3/win32/xpi/ru.xpi
2. In thunderbird open the manage add-ons «Tools → Addons».
3. «Install Add-on From File…».
4. To choose .xpi file
5. «Advanced → Main → Config Editor».
6. to looking for string intl.locale.requested
7. Change his value , sample en-US to ru
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