To make the puzzles as accessible as possible, there is support for any language you would like. Currently there is English, Dutch, Spanish, Portuguese, French and Slovak, but there is always room and functionality to create extra translations right now! :)
I have built my own translation system which is accessible and editable online once you contact me and offer to help. I will give you access and we can start translating the relevant labels for your goal as soon as possible.
Are you for instance a teacher from Germany, or somewhere else? Please contact me at email@example.com and I hope we can work together soon!
If you help me translate more then just a few labels, then we could setup a deal where you get a premium account in return for your translation services! :)