The current implementation of Watson Knowledge Studio imposes very strict (narrow) limitations on the CSV content format that is used for importing Dictionaries.
Knowledge Studio requires that each value is enclosed in double-quotes.
This makes it a) very difficult to produce Dictionaries that are accepted by Knowledge Studio and b) very difficult for novice users to figure out why their dictionaries are rejected by Knowledge Studio.
While there's no official standard for CSV content formatting, there are widely used and accepted rules in practice that pretty clearly define several flexible options for unambiguously specifying the CSV content, while not imposing strict single format.
See a good example here: https://tools.ietf.org/html/rfc4180