Handle the plural form of subject titles

[psrpinto]

The schema of a subject has a title:

// schema/subjects/blog-post.json
{
    "title": "Blog Post",
    ...
}

This title is used in the UI in its plural form, for example here.

We need to come up with a better way to handle the plural form of the title of a subject.

[psrpinto]

@akirk said:

one thing that we need is a plural term in the schema (see get_post_type_labels()),

[ashfame]

Plural representation was also used in api endpoints itself. I specifically moved away from it in #153 but would use it to have plural names from schema, if available.

[psrpinto]

Would you be ok with removing this from the MVP milestone @akirk @ashfame ? I think we can live with hardcoding it for now.

[akirk]

If it's not super quick then let's remove it.

[ashfame]

Doesn't this just require adding a new field to schema? But fine to skip for MVP milestone.

[psrpinto]

Ok, removing from milestone.