moved the loading of lang_api.php to after database_api.php
because functions in lang_api.php issue db calls.
this fixed the bug where language strings were not being loaded.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1784 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9