code cleanup in multiple files

Last changes were merged quickly without strict code-review
as it was needed to integrate them promptly.
Related modifications:
 * callwidget.cpp: Removed unnecessary line feed
 * callwidget.{cpp,ui}: Renamed “contactRequestView” to
   “contactRequestPage” for consistency
 * contactrequestwidget.cpp: Refactoring of a too-long line
 * sendcontactrequestwidget.{cpp,ui}: Better placeholders

Moreover, contactrequestwidget.{cpp,ui} were missing the GPL
header and copyrights' years are now updated to 2017 in every
files.

Change-Id: Id52f340fc62340df6cf5bda8d782fefc732beabe
diff --git a/sendcontactrequestwidget.h b/sendcontactrequestwidget.h
index 9780791..d23788d 100644
--- a/sendcontactrequestwidget.h
+++ b/sendcontactrequestwidget.h
@@ -1,5 +1,5 @@
 /**************************************************************************
-* Copyright (C) 2015-2016 by Savoir-faire Linux                           *
+* Copyright (C) 2015-2017 by Savoir-faire Linux                           *
 * Author: Anthony Léonard <anthony.leonard@savoirfairelinux.com>          *
 * Author: Olivier Soldano <olivier.soldano@savoirfairelinux.com>          *
 *                                                                         *