If you want to reduce your time in DF, enable all languages and the option to enter a dungeon that's already started. The language barrier is rarely an issue. As DPS, especially, all you really need to do is follow the tank, attack what they're attacking, and stay alert. Boss strategies can be an issue, but the auto-translate function can help. Otherwise, stay alert and pay attention to what everyone else is doing. Entering an in-progress dungeon can mean you miss out on a few treasure chests, but (in the grand scheme of things) that's really not that big of a problem anyway.