Well I think if you would upgrade to a new firmware you would get the access to decide between CH / EN like they shipped to me. In the further posts ppl explain how.
The admin access to the miners does allows EN/CH; I am referring to the tool they supply on their website
It will switch to english if your windows is in english. Mine is working ok, and application is waist of time.
Does not switch to english on either of my computers?

Their support sent me an English version of the miner tool EbiteMinerMini[EN]V1.0.2.50.7z
It actually works pretty well, allowing you to set the frequency and fan speed, amount other things