[47124347] standardize error message formatting

Errors with inputing data, like invalid email, should show flash message
at top (There was an error with your data), and a specific message to
the right of the input field (This is an invalid email).

Signed-off-by: Henry Chen <hchen@vmware.com>
Merge pull request #59 from Henry-CF/style

[47124347] standardize error message formatting