GPII-952: Position dialog at the center of the panel.
GPII-543: Apply changes for GPII-957.
GPII-752: Remove jQuery unwrapping.
GPII-952: Pass dom elements as func arguments.
GPII-952: Make sure multiple same messages are shown only once.
GPII-952: Slightly improve messageQueue logic.
Merge remote-tracking branch 'origin/gpii-752' into gpii-543
GPII-960: Add 'learn more' to the dialog.
GPII-960: Add browser language as memeber.
GPII-960: Add support for JSON format of info messages.
GPII-960: Add support for private, help & info messages.