Switch the translation backend from LibreTranslate to Bergamot #2564
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Bergamot is an open-source translation backend, the same one that is currently used by Firefox. Compared to LibreTranslate, the models are much smaller and faster to execute; this means we can perform the translation locally rather than uploading the page contents to a server, which is a nice privacy improvement.
In addition, for the languages it supports, the translation quality seems to be better than LibreTranslate; however, the number of supported languages is smaller. I think that removing support for some languages is an acceptable tradeoff, as the current translation feature often doesn't work very well anyway. It'd be great to get some feedback regarding the differences in translation quality though, if anyone has any.
Fixes #2479