* fix broken functional key layout for tablets
* only show language switch key when there is something to switch to
* make default colors for "all colors" setting random instead of gray
* allow customizing start lag for gestures during typing, by @devycarol
* allow customizing currency keys
* reduce long-press time for shift -> caps lock, by @devycarol
* extend superscript popups in number row and symbols layout, by @b02860de585071a2
* minor fixes and improvements
