Author: Martin Mastny
MDL-61716 auth_oauth2: field names in mappings allow all characters
http://git.moodle.org/gw?p=moodle.git;a=commit;h=06d3bab902e1f023607a97070a3783d831929411
http://github.com/moodle/moodle/commit/06d3bab902e1f023607a97070a3783d831929411
+ 3.4 en [userfieldexternalfield_error,tool_oauth2]