Editor friendly error messages

**Is your feature request related to a problem? Please describe.**
If a part of the CMS is not working for any reason you sometimes get an error message. These error messages can be rather intimidating to the not so tech savvy user.

**Describe the solution you'd like**
Humanize the error messages / alerts / notifications. Something like 'An error has occurred. Try again or contact your friendly developer :) To check what went wrong click here / open console'.

**Describe alternatives you've considered**
Show error messages based on user roles could be a nice feature. If we know you're a developer we can show the error immediately. If we know you're an editor we should try to be less intimidating.