Multi words translated terms should not always use TermQuery

In MTFulltextQueryTermsProvider a single to multi word translation can happen (gracias -> thank you and viceversa) however the implementation always uses TermQuery when building the new query. This might result in unexpected results because while separate terms for each word exist in the index, the usage of a single TermQuery implies there should be a single term covering both tokens, causing the query to return zero results.