QuickSettings : Register/unregister cast tile one time

Don't do these operations every time the parent is visible/invisible,
it causes jank.

Repro:

Turn on wifi on a network w/ chromecast
Swipe down quick settings panel really fast

Change-Id: I3dfcd3610abe96e1bfdab06ef3b876ccf5140ceb
Core FR Translation: fix some translations.

Removed some English words. French is better.

Change-Id: I3ee22806473de779f978a4d258612efe1f0a8ac3
SystemUI FR Translation: fix some translations.

Change-Id: Ifafa20431e996723202c94a35b6661972c7ffe66