My native language is Russian. But I have no problems reading English texts. As for games, I try not to switch to Russian if someone else was involved in the translation (I have sad experience, alas) and mostly play in English. But there is at least one game that I'm following closely - Bright Past. It is created by a Russian-speaking developer who has a good mastery of his native language (a rarity nowadays, oddly enough). He plays well with semantic nuances, using slang or argot when necessary, which adds a certain charm to the game.
As for individual obscure words - online dictionaries for all tastes are at your service.