Translation Agency, highly professional one, should be sworned translators (ترجمان محلف معتمد من الخارجية)as they are very very little here in Qatar. I suggest that you have an office in West Bay area, near to City Center, as most of the embassies and prestigous companies operating there.

It's my sugesstion only, you have to study well the cost of any project you want to start.....

Good luck