#18 Back link after preview of changes

[Digi421]

When a preview of the changed pages is generated and
everything looks ok, you can not use the browser's
back button to go back to the mod list, but you have
to click "install mods" in the ACP, enter the EM
password again and only THEN can you actually commit
the changes.
A button or hyperlink that takes you back from the
preview page to the EM main page would be nice-to-
have.