[REQUEST] Better Error Messages

[wilcochris]

Is your feature request related to a problem? Please describe.
When trying to add an adventure it wouldn't let me and kept saying that a field was required. It didn't state which field it was.

Describe the solution you'd like
A clear error message stating which field is the issue and which field is required.

Describe alternatives you've considered

Additional context
I only knew it was the Icon for the category that was the issue by digging into the browser console then having a look at the error there and looking at the response from the POST. The icon field is not marked as a required field in category. The wording of the pink box should be Show Emoji Picker indicating that an emoji can be chosen and then it should be Close Emoji Picker once it is open. There is nothing here that denotes this is required. Perhaps it should be "Open Emoji Picker [*]"