Fix vertical alignment of shortcut icons

- Add min-height to shortcut label

Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/templates/index.html

@@ -41,7 +41,9 @@
                       <center>
                         <img src="{% static 'theme/icons/' %}{{ shortcut.icon }}.png" style="max-width: 100px; height: 100px" />
                         <br>
+                        <div class="shortcut-label">
                         {{ shortcut.label|linebreaks }}
+                        </div>
                       </center>
                     </a>
                   </li>

static/themes/default/css/plinth.css

@@ -113,4 +113,8 @@ footer {
 
 footer license-info p{
     margin: 20px 0;
+}
+
+.shortcut-label {
+    min-height:50px;
 }