GPII-150: Removed theme overrides for DT and replaced with class fl-inverted-color. Added low contrast themes
GPII-150: Tweak focus styling on prefs
Merge remote-tracking branch 'heidi/GPII-150'

* heidi/GPII-150:
  GPII-150: Tweak focus styling on prefs
  GPII-150: Removed theme overrides for DT and replaced with class fl-inverted-color. Added low contrast themes