WIP: Change Exemplary and Malice label prompts to be form-based

Fixes #311.

This changes the prompt asking for a reason to exemplary/malice from using prompt() to using a proper form with Intercooler.

I've marked it as WIP because there are several problems that I'm not sure how to deal with:

• The prompt text doesn't break on newlines, you can see this in the picture above.
• Clicking on the labels and then cancelling submitting a reason will still remove the label from appearing (if its exemplary) or set it to active (if its malice) even though the labels aren't applied. A refresh resets it back to normal.
• Cancelling submitting a reason will make it so you have to click on "Label" twice before the labels appear again.
• When an error occurs (like leaving the reason empty) the status message doesn't appear properly.