UI theme settings

Error message

Deprecated function: Using ${var} in strings is deprecated, use {$var} instead in include_once() (line 1439 of /home/cqhuapyt/www/android/includes/bootstrap.inc).
Deprecated function: Using ${var} in strings is deprecated, use {$var} instead in include_once() (line 1439 of /home/cqhuapyt/www/android/includes/bootstrap.inc).

The theme settings offers the following options:

Font size, with sizes for mobile phones or tabs.
Alternative themes, to choose from dark/light or system-defined.
Theme color, the main color used throughout the app.
Button styles, choose from 11 styles. Suggest new ones if you feel like it!
Tab style, at the top or bottom or completely hidden.
Tab font size, should you want to customize it to your liking.
Application colors, for user-installed, system-installed and Linux-kernel processes, those colors are used to highlight apps category.
Icons theme, either material, 3D or theme-color-tinted 3D.