error/moodle/cannotcustomizelocallang
From MoodleDocs
This error occurs because you don't have the capability moodle/site:langeditlocal.
Note: You are currently viewing documentation for Moodle 2.0. Up-to-date documentation for the latest stable version is available here: error/moodle/cannotcustomizelocallang.
This error occurs because you don't have the capability moodle/site:langeditlocal.