It sea4ches in different languages, but there is no way to force language of the results. Instead, ot tries to be “smart” and uses languages of the region. So it has the same problem Google and Bing does: giving you results in random languages outside of language region (or in multi-lingual regions), even when request is explicitly in language A.
There is a feature request to implement this setting, but not much hope to have this soon.
On this note, if someone knows of a search engine that allows specifying language of results, please let me know :)