Provide a handy link back to the edit form from the preview warning.
Tiny UX/accessibility improvement copied from German Wikipedia,
hopefully uncontroversial. :-)
Change-Id: Ieba9b640bca719e8eedd7c204f3516700dcf15fe
'updated' => '(Updated)',
'note' => "'''Note:'''",
'previewnote' => "'''Remember that this is only a preview.'''
-Your changes have not yet been saved!",
+Your changes have not yet been saved! [[#editform|→ Continue editing]]",
'previewconflict' => 'This preview reflects the text in the upper text editing area as it will appear if you choose to save.',
'session_fail_preview' => "'''Sorry! We could not process your edit due to a loss of session data.'''
Please try again.