Port "Phone: Add transparency to incall screen"

From http://review.cyanogenmod.org/#/c/20771/

Change-Id: Ie366d3bcdb38c497e89848f8534f7f1af317a9fa
Make going to call log after call optional.

NOTE: This included all translations from CM

JIRA: CYAN-528
Change-Id: I1cab653e9ac28b767ae3aeebceeaf822d9438b4c