Add translation for Authors folder

[jnptk]

ToDo

• Add tests
• Fix id not being translated

Fix #50

[davisagli]

@jonaspiterek Have you actually tested this with a different language? I don't think it will work.

Message id objects created with the _ helper are automatically translated into the current language in certain places -- such as when they appear in a template or are serialized to JSON for an API response. But, I don't think api.content.create will take care of translating them. So, I expect that we need to do it manually before passing the translated values into api.content.create.

Here's an example of how to do it manually: https://github.com/plone/plone.restapi/blob/d5b83a67b5a894b7985c67e6c2ae0c9eb1034fd6/src/plone/restapi/services/users/add.py#L40

[jnptk]

@davisagli I did tested it with a different language and it is kind of working, "title" and "description" get the translation. But "id" does not. Also the breadcrumbs which I believe use the "title" don't work.

[ericof]

@jonaspiterek, take a look if it works as expected now.

[ericof]

Additional code added here to handle the plone/plone.api#524 issue

[jnptk]

@ericof Works exactly as expected