changes for #77

Code cosmetics
#75:
- More debug infos for kindlegen and sending e-mail.
- Button for sending test e-mail.
- timeout of 5min for sending e-mail

cps/templates/email_edit.html

@@ -27,7 +27,8 @@
       <label for="mail_from">{{_('From e-mail')}}</label>
       <input type="text" class="form-control" name="mail_from" id="mail_from" value="{{content.mail_from}}">
     </div>
-    <button type="submit" class="btn btn-default">{{_('Submit')}}</button>
+    <button type="submit" name="submit" value="submit" class="btn btn-default">{{_('Save settings')}}</button>
+    <button type="submit" name="test" value="test" class="btn btn-default">{{_('Save settings and send Test E-Mail')}}</button>
     <a href="{{ url_for('user_list') }}" class="btn btn-default">{{_('Back')}}</a>
   </form>