[en_US][ALL LANG] Redundant string 'M2' in page title 'Repository Content' under Authoring - Artifact repository.

Description of problem:
[en_US][ALL LANG] Redundant string 'M2' in page title 'Repository Content' under Authoring - Artifact repository.

Version-Release number of selected component (if applicable):
6.4.0.GA ER3

How reproducible:
100%

Steps to Reproduce:
1. Click Authoring -> Artifact repository.

Actual results:
[en_US][ALL LANG] Redundant string 'M2' in page title 'Repository Content' under Authoring - Artifact repository.

Expected results:
'M2' should be removed.

Additional info:
Please see the attached screen-shot.