Upgrade Content API Client to 3.2

For some reason a bunch of arbitrary things have changed in version 3, like the name of the ApiError class and the package the client uses. Hence this massive pull request, sorry. :-1: 

CC @rich-nguyen @gklopper @phamann 

We need to upgrade because the latest version contains the fields by which we can sort the contributors in proper alphabetical (last name first) order.
Well, all it'll do is if the exact credit appears at the end of the caption not display the caption. This won't catch situations where they've mistyped one, but the ideal solution is that they don't add the credit to the caption to begin with.