This is an easy one. When starting the management console the language of the local OS will be detected. Then it will search if a language pack is present. When found, the corresponding language will be shown and troubleshooting will instantly become a lot harder (or you can just try to search for non-English errors, good luck).
Two solutions are possible to show the interface in English:
1. Change your OS language from your control panel (Regional settings). Yes, that’s a solution, but of course you already thought about that and don’t want to. So, solution 2: