Update empty-folder.html
Update empty-folder.html

Removed exclamation mark like suggested at GitHub.
See https://www.transifex.com/nextcloud/nextcloud/translate/#af/$/120308848?issue=yes
ChristophWurst/mail,ChristophWurst/mail,kingjan1999/mail,kingjan1999/mail,ChristophWurst/mail,kingjan1999/mail