So when a page loads, vanilla will fade the contents in. I've looked pretty hard -- does anyone know where this is at? A loading bar/popin is way better, so I was going to fork and pull that out of lavender.
Thanks for reporting the bug @mootzville, the templates property is no longer required in a custom theme's theme.json in v0.5.1 (but since we haven't even launched v0.5.0 yet, don't worry about a thing, the fix is backwards compatible)
in the client, those values are stored in ajaxify.data
For your jQuery, you don't append a closing tag, it does that automatically. When you want to insert the element into the div, you need to use appendTo(). Also, unless your label has additional data, I recommend using html() instead of text().
Here's a fiddle. I also added an ID to the new label so it isn't added more than once.