Markdown support for fields `Reference files description` and `Conditions for use`

[SebastianOpriel]

Adjust fields:

• Reference files description
• Conditions for use to be processed as Markdown.

### Tasks
- [ ] EDC-UI: Add markdown support for `reference files description` field
- [ ] EDC-UI: Add markdown support for `Conditions for use` field
- [ ] Adjust field info on creation: Add hint about markdown support
- [ ] If necessary adjust field info on edit page.
- [ ] EDC-UI: Add markdown processing in asset details view
- [ ] Authority Portal: Add markdown processing in asset details view