I think an Islamic based language would be tight, I'm being dumb and can't think of the language name other then farsi and I have no idea how to spell that. But I think you get the idea, and an Islamic Linguistic is one of the most wanted jobs by things like the government bodies, big oil companies, and many multi national companies all want those type of people, because the middle east is to a point an untapped market. Other sweet languages imo German, Russian, and any asian language.