Em dash instead of en dash

~dev_rating/application/views/student/index.twig

@@ -11,7 +11,7 @@
 					{{ (100 * i.rate) // i.maxCurrentRate }}%
 				{% endif %}
 			{% else %}
-				---
+				—
 			{% endif %}
 		</span>
 	</td>
@@ -24,7 +24,7 @@
         {% for teacher in i.teachers %}
             {{ teacher }}<br>
         {% else %}
-            ---
+            —
         {% endfor %}
     </td>