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

biscuit/core/templates/core/edit_group.html

@@ -12,7 +12,7 @@
   <form method="post">
     {% csrf_token %}
     {% bootstrap_form edit_group_form %}
-    <button type="submit" class="btn btn-primary">
+    <button type="submit" class="btn btn-secondary">
       {% blocktrans %}Edit{% endblocktrans %}
     </button>
   </form>

biscuit/core/templates/core/edit_person.html

@@ -18,7 +18,7 @@
   <form method="post" enctype="multipart/form-data">
     {% csrf_token %}
     {% bootstrap_form edit_person_form %}
-    <button type="submit" class="btn btn-primary">
+    <button type="submit" class="btn btn-secondary">
       {% blocktrans %}Edit{% endblocktrans %}
     </button>
   </form>

biscuit/core/templates/core/persons_accounts.html

@@ -45,7 +45,7 @@
       {% endfor %}
     </table>
 
-    <button type="submit" class="btn btn-primary">
+    <button type="submit" class="btn btn-secondary">
       {% blocktrans %}Update{% endblocktrans %}
     </button>
   </form>