SystemUI: show date on 2 lines in status bar

Based on: http://review.cyanogenmod.org/30263

Change-Id: If44a8177132cb445fa6cb4eb11f59e97775bccaf

Conflicts:
	packages/SystemUI/res/layout/status_bar_expanded_header.xml
	packages/SystemUI/res/values/donottranslate.xml