Move android:windowTranslucentNavigation to values-v19

Fixes app crash in Android 4.1

	new file:   res/values-v19/styles.xml
	modified:   res/values/styles.xml
Add option to set backlight color as transparent highlight color

	modified:   java/info/tellmetime/TellmetimeActivity.java
	modified:   res/layout/activity_tellmetime.xml
	modified:   res/values/strings.xml