Use btn-secondary instead of btn-primary. Closes BiscuIT-ng#83.

biscuit/apps/alsijil/templates/alsijil/group_week.html

@@ -14,7 +14,7 @@
     <ul id="timetable_select_form">
       {{ select_form.as_ul }}
     </ul>
-    <button type="submit" class="btn btn-primary">
+    <button type="submit" class="btn btn-secondary">
       {% blocktrans %}Select{% endblocktrans %}
     </button>
   </form>