The suggestion is simple. In the section that shows the languages on the game page, if the game does not have a translation for your language, include a "Request this language" button. This way, the developer will know how many people are asking for the translation of that specific game. Also include information on whether the person has already purchased the game, or if it is on their wishlist.

It is a simple addition that makes it easier to request a translation for your language. It is better than requesting it on the game's discussion page.