error/moodle/cannotcustomizelocallang
From MoodleDocs
This error occurs because you don't have the capability moodle/site:langeditlocal.
Note: This documentation is for Moodle 2.7. For up-to-date documentation see error/moodle/cannotcustomizelocallang.
This error occurs because you don't have the capability moodle/site:langeditlocal.