dialog text hard to see with dark theme

[adamfk]

Hello!

When the dark theme is used, some dialogs have text which is hard to see (black on dark).

I can see it OK, but some people with worse vision basically can't see it.

I don't see this particular issue with the draw.io electron app or website.

The color rule comes from:

Hopefully this is an easy fix. I didn't see any problems when I manually changed that to #CCC to match the menus.

Thanks for excellent extension.

[MoinFaiz]

Another example