Removed all inline javascript focus code, general function to protect all password fields including tooltip

When uploading a logo which is smaller than the current ispconfig one, then the logo will be on the left side of the header. In my opinion it will look better when it's centered.
You could vote about it ;)

Fixed issue #3955 DNS module: Limit for maximum zones can be circumvented with "import zone file" function.
Removed TODO string in error template.

- Fixed mailuser login

This reverts commit 92c1d331.

- hooked ssl and ssl_letsencrypt checkboxes