Converted page translation logs to LogFormatter

Change-Id: I31fd29aac381533f1feb58e9979465ba17a939bc
Make (en|dis)couraging changes immediately visible

Introduced MessageGroups::setPriority that handles
cache clearing

Change-Id: I3049ffcacd169d3fa41a2f00572415ffa95f6477
Merge changes I3049ffca,I31fd29aa

* changes:
  Make (en|dis)couraging changes immediately visible
  Converted page translation logs to LogFormatter