Hey! You are doing really good work. I just thought about the rule you mentioned, it says "Only English is allowed". We all know that Mental health is not something which is language specific. Someone said- it's easy to handle things in english. But there are many people who can speak more than one language, you can give them option for other languages also, you can hire mods in different languages and make the common language English for the communication between you and mod. May be that person knows German and English both.
You will grab more big audience.
And it's not that tough.