Don't replace data-src with src in acl-template

On pageload an empty acl-list-item as template is created and not yet replaced.
Don't change the data-src for src attributes in those images.
No need to remove data-src attributes

Better comment string also
Merge pull request #573 from oohlaf/fixes

Don't add src attributes inside acl-template
If we're going to encode the email headers, we probably should use the encoded version rather than the original
Merge https://github.com/friendica/friendica into pull
We haven't Got Zot