Change message when webmention already exist.

[jgmac1106]

I see many people who have sent a webmention natively then go to the webmention form on the target and try to add a link.

The error message from wp-json/webmention/1.0/endpoint confuses users. The fact that they already sent webmention barely registers.

Warning: trim() expects parameter 1 to be string, array given in /homepages/32/d491429024/htdocs/boffoblog/wp-content/plugins/semantic-linkbacks/includes/class-linkbacks-mf2-handler.php on line 164

Webmention was successful

I would suggest:

<img src="https://webmention.rocks//assets/webmention-rocks.png">
<h2>Congratulations, you  sent a webmention already.</h2>
<p>Thanks for joining us by taking control of your content and staying connected with people who support an IndieWeb. ” </p>