Error messages from "Add ability to duplicate the common metrics dashboard"

We should improve the error messages in the modal for dashboard duplication.

Review comments

by @nadia_sotnikova

Error	Comment
	This looks fine.
	I think we need to add input field validation like in the above example. And perhaps we could reword it to be easier to read? For ex. "There was an error creating the dashboard. File name is missing."
	A period is missing at the end of the sentence. Otherwise, it looks ok, but I wonder if we can make it better as part of a follow-up issue to work on with a Technical Writer
	A period is missing at the end of the sentence. Otherwise, it looks ok, but I wonder if we can make it better as part of a follow-up issue to work on with a Technical Writer

Original discussion

The following discussion from !21929 (merged) should be addressed:

• @mrincon started a discussion:

  When the user opts for leaving the file name empty they will see an error message which refers to file_name an internal name.

  

  I think this message can be improved to guide the user.