Author: Jean-Michel Vedrine
MDL-37897 Remove useless Blackboard question import format
http://git.moodle.org/gw?p=moodle.git;a=commit;h=4f315786e8a010865d41af7726aa9743aed64bb8
http://github.com/moodle/moodle/commit/4f315786e8a010865d41af7726aa9743aed64bb8
+ 2.5 en [pluginname,qformat_blackboard_six]
+ 2.5 en [pluginname_help,qformat_blackboard_six]