UWMOODLE-306 block course_overview_uwmoodle : Fixed language string issue

lang/en/block_course_overview_uwmoodle.php

@@ -40,7 +40,6 @@ $string['messages'] = 'messages';
 $string['movecoursehere'] = 'Move course here';
 $string['numtodisplay'] = 'Number of courses to display: ';
 $string['otherexpanded'] = 'Other Courses Expanded';
-$string['pluginname'] = 'Course overview';
 $string['preservestates'] = 'Preserve Expanded States';
 $string['shortnameprefix'] = 'Includes {$a}';
 $string['shortnamesufixsingular'] = ' (and {$a} other)';