Ability to customize fonts / change between previous Discord font

The new font is't horrible, but it was clearly not made for non-latin letters. Whitney was fine in Greek and then... gg Sans looks like "baby's first typeface". μ and π are commenly broken in fonts that aren't properly made for them, and this is evidently not made with care. Not to mention the style doesn't even match properly with latin letters!

Now I have to look at it until something is done... Great job Discord.