forum MDL-23388 altered help string to provide information on the role of caps in forum throttling
http://github.com/moodle/moodle/commit/e51b3cfc0c1094315b9100e750994d3e713d592f
+ 2.0 en [blockafter_help,mod_forum]
+ 2.0 en [blockperiod_help,mod_forum]
+ 2.0 en [warnafter_help,mod_forum]