When you can't read a game's page, or the text in a game, you can't play it. That doesn't mean anything about the quality of the game, but it's annoying to be constantly served games that look good but would be, in practice, not possible for me to play in the manner intended!
Add a language/language support tag option to games and the ability to filter in and out by language in searches.
(Also, this system should extend to comics, books, etc. where the text is even more important to the experience.)