custom scrolling values 2/2

ported from https://gerrit.omnirom.org/#/c/4249/
originally written by Yanuar Harry <ai.the.smarties.physics@gmail.com>

PS2: make help icon not selectable and fix capitalization consistency

Change-Id: I89cac4e9c2f5a495339a8495bce11e42f49ee05e

Conflicts:
	res/values/vanir_strings.xml
	res/xml/prefs_animation_controls.xml

Signed-off-by: DHOMD <DHO@dho.im>