Add notes for the "Take it" translation

Signed-off-by: William Desportes <williamdes@wdes.fr>

templates/home/themes.twig

@@ -9,7 +9,7 @@
             <h5 class="card-title">{{ theme.name }} <small>({{ theme.version }})</small></h5>
           </div>
           <div class="card-footer">
-            <button type="submit" class="btn btn-primary" name="set_theme" value="{{ theme.id }}">{% trans 'Take it' %}</button>
+            <button type="submit" class="btn btn-primary" name="set_theme" value="{{ theme.id }}">{% trans %}Take it{% notes %}Choose the theme button in the themes list modal{% endtrans %}</button>
           </div>
         </div>
       </div>