As to the first point, vBET uses translation providers to automatic translation user messages and rest of forum content to forum language and other configured languages.
The most important features vBET can be found here: http://www.vbenterprisetranslator.co...-features.html.
As for the second point, full version vBET allows you to disable translations of certain words using AdminCP->vBET->Translation Options->Ignored words/sentences.
For more information see: http://www.vbenterprisetranslator.co...ranslated.html