Change icon for substitutions

.idea/modules.xml

@@ -3,7 +3,6 @@
   <component name="ProjectModuleManager">
     <modules>
       <module fileurl="file://$PROJECT_DIR$/.idea/school-apps.iml" filepath="$PROJECT_DIR$/.idea/school-apps.iml" />
-      <module fileurl="file://$PROJECT_DIR$/.idea/school-apps.iml" filepath="$PROJECT_DIR$/.idea/school-apps.iml" />
     </modules>
   </component>
 </project>
\ No newline at end of file

.idea/vcs.xml

@@ -2,5 +2,6 @@
 <project version="4">
   <component name="VcsDirectoryMappings">
     <mapping directory="" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/schoolapps/static/materialize" vcs="Git" />
   </component>
 </project>
\ No newline at end of file

schoolapps/templates/partials/header.html

@@ -121,7 +121,7 @@
                 </li>
                 <li>
                     <a href="{% url 'timetable_substitutions' %}">
-                        <i class="material-icons">person</i> Vertretungsplan
+                        <i class="material-icons">update</i> Vertretungsplan
                     </a>
                 </li>
                 <li>