Author: John Okely
MDL-53832 enrol_lti: Separate tool launch and proxy registration logic
http://git.moodle.org/gw?p=moodle.git;a=commit;h=da65fcf02733f38886884c3f0c46e46a619220b4
http://github.com/moodle/moodle/commit/da65fcf02733f38886884c3f0c46e46a619220b4
+ 3.2 en [couldnotestablishproxy,enrol_lti]
+ 3.2 en [invalidrequest,enrol_lti]