Default data types values contain underscores #572
Description
When integrating DAISY with other tools (e.g. DC), data types are taken from DAISY.
Current default values core/fixtures/datatypes.json are not following any onthology/vocabulary
Also, they contain underscore instead of space.
- remove underscores from the default values
- annotate the default values with existing onthologies (OBI, NCIT, ...)