It works, but I still wonder how to get this from the UI. Did you also find the filter pages from a search engine or did you use some button/field?
For Master Dungeon, indeed if you look at the details you can see all the languages… and also “Textless”. So it makes sense and fills the criterion “you can play it if you know language X”, but it doesn’t mean you did anything special for this language either. Reminds me of my other post on accessibility (https://itch.io/t/665833/color-blind-friendly-accessibility-feature-for-a-game-that-happens-not-to-need-colors).
Maybe there should be a filter “French OR Textless” so devs don’t have to do add all languages when there is no or little text, just to appear in all filter searches.