Wrong language selected at startup

I'm using an English Windows 10 and have heidisql set to auto langauge but the language selected is Danish

My country on Windows is set to Denmark but all Windows is in English. So shouldn't heidisql also select English as auto language?

Using 5169

I'm not 100% sure where the auto detection reads that setting, but if you say your country setting is set to Danish and HeidiSQL detects Danish, then I highly guess that's the reason.

You should just set your wanted language, in Tools > Preferences > General.