Add spinner to feedback button while sending

[GrahamSH-LLK]

This UX will help the user realize that their feedback is sending, and when it stops spinning, they instantly know the "work" is over.

This can be added with

<div class="spinner-border-sm spinner-border" role="status"></div>

[Hans5958]

We already have the feedback status alert, but I'll see what I can do.