If you see untranslated text it is not vBET bug or error. It appears when you've reached your limits in all tranlation APIs - you can easly check it here:
NOTE:AdminCP -> vBET -> Translation Providers Availability
It is strongly unrecommended to change these values manualy, becouse vBET will do it itself!
In this situation (there is no available translation API) vBET will use dummy translator. It means that already cached translations will be displayed and for not existing translations original text will be shown (not empty one like before - this can happen only when provider refuses translation).
Translation providers set limits (Microsft Api Translation and Google Api Translation v1 have their own limits, in case of Google Api Translation v2 you can set it by your own) and since versions 4.4.3 and 3.3.8 vBET when more than one provider supports translation then vBET will use preferred one first.
And in case if one of translation API is not available - which means you have reached your limits - vBET will switch to another, and in every 10 minutes vBET will check is the translation API available again.
Please note that you have to turn off option Use Google Only and set appropriate API keys to use providers queue. For details please see:
Also You can check if you reach your limits by run these tests TESTSAdmin CP -> vBET -> Translation Providers