CTHUB - casing

**Describe the task**
We installed DRF camel case, but the conversion from backend snake_case to frontend camelCase wasn't exactly what I anticipated, because some keys in the backend weren't snake_cased at all (didn't have underscores in them; please see https://github.com/vbabiy/djangorestframework-camel-case/blob/master/djangorestframework_camel_case/util.py#L37). For example, we have "Expected Type" in the backend, which we should change to "expected_type", which will then become "expectedType" in the frontend.

**Purpose**
Consistency across this project and with our other projects.

**Acceptance Criteria**
- [ ] snake_case backend keys
- [ ] camelcase corresponding frontend keys
- [ ] check that everything works as expected

**Additional context**
- This is a very low priority issue!