Improve error messaging

[kelliedesigner]

AS a user,
I NEED clear error messages when something needs to be corrected,
SO that I can be confident about what is expected of me in order to proceed.

Links and resources

Copy document:
https://docs.google.com/document/d/1g7ET6R6PlLQVHjgrP8dwM51vttOLnTgIQIkUm0aFsbA/edit?usp=sharing

Acceptance Criteria

• Error messages follow what is outlined in the linked document
• Works on target devices and browsers

[ritapatel7]

This actually needs to be updated in the ruby code, where errors end with "can't be blank" we need to remove the last bit and add 'Enter' at the beginning instead or select for multi select etc.
Is this one for @tosbourn ?