minor code style and css corrections

Changes the name of a button to fit in with the naming style
and the ui representing it.
Also corrected indentations problems and authors list.

Change-Id: I307a9a38775760cabc95ea73f62c998823ec15d5
Reviewed-by: Anthony Léonard <anthony.leonard@savoirfairelinux.com>
diff --git a/configurationwidget.cpp b/configurationwidget.cpp
index 361aa77..641ab3c 100644
--- a/configurationwidget.cpp
+++ b/configurationwidget.cpp
@@ -1,6 +1,8 @@
 /***************************************************************************
  * Copyright (C) 2015-2016 by Savoir-faire Linux                           *
  * Author: Edric Ladent Milaret <edric.ladent-milaret@savoirfairelinux.com>*
+ * Author: Anthony Léonard <anthony.leonard@savoirfairelinux.com>          *
+ * Author: Olivier Soldano <olivier.soldano@savoirfairelinux.com>          *
  *                                                                         *
  * This program is free software; you can redistribute it and/or modify    *
  * it under the terms of the GNU General Public License as published by    *