Solved plugin problems?

I think I may have solved the problem of the plugin not working.

Line 192 originally read `$post = isset($_POST['data']) ? $_POST['data'] : [];`

However, `$_POST` as received from the form did not contain any element `data`. I replaced that line with the admittedly simpler
````
If (isset($_POST)){
$post = $_POST;
}
````

The plugin now works in my installation. I didn't actually fork the plugin, and so am not sure how to file a PR.

I also reversed `email` and `addComment` in the process section of `comments.yaml` to avoid the problem of receiving an email even though the comment was not saved.

This fix works even without `language` being set.