* Switch the last few remaining icons to true glyphs
(Del/Backspace & Enter).
Also, allow a glyph to be rendered in (fake) bold, and use it for Enter.
* Update fonts
Pickup the tweaked nerdfonts for the backspace symbol
Follow-up to #5583.
* Add separate Cyrillic/Russian keyboard
* And remove that from English
* Update French keyboard (is easy)
* Remove yahzhert, that was just a double of QWERTY
* Update Spanish keyboard
* Reduce Japanese to 4 layers and add globe
* Reduce Korean to 4 layers
* Reduce Greek to 8 layers
* Add a basic Japanese keyboard layout
Allow for entring Japanese text into text boxes. Only supports kana
and latin letters due to limitations of current VirtualKeyboard
implementation (complex text input with conversion is not possible).
* Allow keyboard layouts to declare custom modifiers
Refactor modifier key setup code and existing keyboard layouts so
that each layout can declare custom modifier key labels. This
allows for greater extensibility and for future keyboard layouts.
