Append file etag to preview URLs

apps/files/ajax/newfile.php

apps/files/ajax/upload.php

apps/files/js/file-upload.js

apps/files/js/filelist.js

apps/files/js/files.js

apps/files/lib/helper.php

apps/files/templates/part.list.php

apps/files_sharing/public.php

core/js/oc-dialogs.js

lib/private/helper.php