MDL-10639 - Missing string (merge from 1.9)

lang/en_utf8/grades.php

@@ -161,7 +161,7 @@
 $string['export'] = 'Export';
 $string['exportfeedback'] = 'Include feedback in export';
 $string['exportplugins'] = 'Export plugins';
-$string['exportselectedoutcomes'] = 'Export selected outcomes';
+$string['exportalloutcomes'] = 'Export all outcomes';
 $string['exportsettings'] = 'Export settings';
 $string['exportto'] = 'Export to';
 $string['extracredit'] = 'Extra Credit';