LanguageTool Premium Credentials in Plugin

Hi,
I’m having some issues with this plugin’s connection to the LanguageTool Premium server. I have inserted the Username, Password and API key. Should be only the Username and API Key, but now I’m not able to remover the password. I have unstalled the plugin, Trados and deleted any folder I could find related to LT, but when I reinstall anew, it shows up filled-out (username, password and plugin), and I get an error and am not able to connect.

Anyone know how I can delete the password permanently?

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