MAGETWO-35192: Wrong copyright text on storefront

- Removed old useless file
- Admin panel updates

Author: Natalia Momotenko

app/code/Magento/Backend/view/adminhtml/templates/page/copyright.phtml

@@ -9,5 +9,5 @@
 ?>
 <p class="copyright">
     <a class="link-copyright" href="http://magento.com" target="_blank" title="<?php echo __('Magento') ?>"></a>
-    <?php echo __('Copyright &copy; %1 Magento, Inc. All rights reserved.', date('Y')) ?>
+    <?php echo __('Copyright &copy; %1 Magento. All rights reserved.', date('Y')) ?>
 </p>

app/code/Magento/Backend/view/install/templates/page/copyright.phtml

@@ -42,7 +42,7 @@ Disallow: /*SID=
                 <welcome>Default welcome msg!</welcome>
             </header>
             <footer translate="copyright">
-                <copyright>&amp;copy; 2015 Magento Demo Store. All Rights Reserved.</copyright>
+                <copyright>Copyright &#169; 2015 Magento. All rights reserved.</copyright>
             </footer>
         </design>
         <theme>