Missing frequency display for m-f

Reported by Gerard FENELON on rt-users

share/html/Elements/RT__Dashboard/ColumnMap

@@ -100,6 +100,9 @@ my $COLUMN_MAP = {
                 elsif ($freq eq 'daily') {
                     $frequency = loc("daily at [_1]", $hour);
                 }
+                elsif ($freq eq 'm-f') {
+                    $frequency = loc("Mon-Fri at [_1]", $hour);
+                }
             }
 
             return \('<a href="'.$url.'">'.$frequency.'</a>');