Enhancement 0002377: Index user names in manage user page by letters.

M manage_user_page.php

• Add links ALL, A..Z, and make the page filters based on the clicked link. If no letter is specified, the A letter is taken as the default.

M lang/strings_english.txt

• Added string for 'ALL'.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@2197 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9