OC-459:new string server_url, new bool show_server_url_input. OC-394

res/values/branding.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    
+    <string name="server_url">"http://beta.owncloud.com/owncloud/"</string>
+    <bool name="show_server_url_input">false</bool>
 </resources>