Submission system - content edits

Edited messages.xml file and a few java files to incorporate content edits from https://docs.google.com/a/datadryad.org/document/d/1cyBCUBRihCKtVAqFNNMKgQS81qbrInoyJOIuM7gG-W0/edit. Verified on localhost.
this button has the text `Complete tegistration`