[Feature Request] Dark Mode option

[ikeman32]

I would truly love to have the ability to switch to dark mode. I'm middle aged and my eye sight is not what it use to be. Dark mode is an eye saver.

Just recently upgraded to 3.6 for my Linux Mint Laptop after I fixed the problem between the user and keyboard. Had some dependency problems and almost dived into the dependency hell pit. But one distro-upgrade later I am in business. In case anyone else has problems installing/upgrading to 3.6. PolyGlot does not work on Linux Mint 21, they need to be running Mint 22.

Thanks.

[TrapinchO]

related to #1310 and #608