Errors with wrong slug

[nvivien]

Helo,

Above all, great plugins as compared to other similar plugins which loads page via ajax instead of embed it at the beginning of the main page.

I have face problems because the slugname has different value to link.

E.g.
slugname = general-conditions
link = confidentials

The modal was loading indefinitely. I thus modif js to display the errors returned and I have also correct the variable $slug in case there are query to url. ex. < a class="modal-link" href="general-conditions?customize_changeset_uuid=xxx" / > (You can get this type of url when you customize your themes)

I have also correct some PHP Notice shown in Admin page.

I was not able to pull my request. Here is a patch version:
Errors with wrong slug.patch

Regards,
NV