Author: Davo Smith
MDL-52811 course: prevent setting of 'lang' without permission
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1433a07881c0cb4c48d1ff8c0032311605b8f0f9
http://github.com/moodle/moodle/commit/1433a07881c0cb4c48d1ff8c0032311605b8f0f9
+ 3.5 en [cannotforcelang,tool_uploadcourse]