fix for 0009430: bug_graph_bystatus shows heading by_category
fix for 0009431: no localization for usage of open, resolved, closed in bug_graph_bystatus.php

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@5452 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9