diff --git a/biscuit/apps/chronos/templates/chronos/edit_substitution.html b/biscuit/apps/chronos/templates/chronos/edit_substitution.html
index 56c3a5f810d296808697d6174be63a48bc9dec7c..2a6d879d488e96149fa35c4df2ebef9483d3fca4 100644
--- a/biscuit/apps/chronos/templates/chronos/edit_substitution.html
+++ b/biscuit/apps/chronos/templates/chronos/edit_substitution.html
@@ -21,6 +21,8 @@
   <form method="post">
     {% csrf_token %}
     {% bootstrap_form edit_substitution_form %}
-    <input type="submit" value="Save" />
+    <button type="submit" class="btn btn-primary">
+      {% blocktrans %}Save{% endblocktrans %}
+    </button>
   </form>
 {% endblock %}
diff --git a/biscuit/apps/chronos/templates/chronos/tt_week.html b/biscuit/apps/chronos/templates/chronos/tt_week.html
index d8cd01849b516a8c2ec1624e2aad010af2e57888..2077afa3d8a0aa931f6f227334356c5790e23423 100644
--- a/biscuit/apps/chronos/templates/chronos/tt_week.html
+++ b/biscuit/apps/chronos/templates/chronos/tt_week.html
@@ -31,7 +31,9 @@
     <ul id="timetable_select_form">
       {{ select_form.as_ul }}
     </ul>
-    <input type="submit" value="Select" />
+    <button type="submit" class="btn btn-primary">
+      {% blocktrans %}Select{% endblocktrans %}
+    </button>
   </form>
 
   <div class="row">