Improve notification shade collapse code.

- Collapse after dismissing the last notification
- Avoid duplicate code paths for collapsing
- Improve variable naming according to AOSP review suggestions

Change-Id: Ic6f26a61f263c5beebbcc9725fe8914d3858576f
Derp Fix

Change-Id: Id36d6f5ebc8700312425f4f22029203e46d24389
Core: NL translation

ps2: move changes to cm_strings

ps3: trigger fixed cid

ps4/5: remove quotes

Change-Id: I3b4a0fa8dbc8eac84aee9d5f59a8fbd5caa3fd82