Repository Browser should give a more detailed error message

[GrantWWalker]

Currently the repository browser only shows this

for any error in the data service.

We should probably create an interface that a user could format their errors into so the repository browser can show custom messages from the server.

We might also want to update it so that it fires off an event if there is an error so the user can handle the error in their own code. (Example: Showing a toast message)