Author: Dan Poltawski
MDL-30617 lang: improve mod chooser strings
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1edff8c7ed08339e0e42e9fab64aa909de627e71
http://github.com/moodle/moodle/commit/1edff8c7ed08339e0e42e9fab64aa909de627e71
+ 2.3 en [modchooserenable,core]
+ 2.3 en [modchooserdisable,core]
- 2.3 en [choosemodtype,core]