"This locale hasn't seen any activity in almost 2 years, and we failed to revive the community effort."

https://bugzilla.mozilla.org/show_bug.cgi?id=1307995

https://bugzilla.mozilla.org/show_bug.cgi?id=1304743

Localization is done by volunteers. If the team that is providing the translations does not complete the translations then the localization is dropped

> This locale hasn't seen any activity in almost 2 years, and we failed to revive the community effort.

> The plan is to stop building Firefox Beta and Firefox Release, and move existing users to Russian.

> I think it would also be a good idea to stop building Firefox Aurora, and remove Belarusian from product-details, but I'm open to different opinions.

- bug 1304743

As someone already explained, Mozilla localization is done completely by volunteers.

You reach a point where the amount of English strings is so high in the UI that is more confusing than helpful to ship a localized version like that. Also considering the target of localized builds.

The good news is that we can start shipping back Belarusian if there are new volunteers working on it steadily (it just happened for Georgian in 51).

There are a few working already, but they need all the help they can get https://groups.google.com/d/msg/mozilla.dev.l10n/dxf7HliMGE4... https://pontoon.mozilla.org/be/firefox-aurora/