feat(interview): Contact modal [4]

[jochenklar]

This PR adds the possibility to send questions though a contact form directly from the interview. It contains:

• PROJECT_CONTACT and PROJECT_CONTACT_RECIPIENTS settings
• different templates to customize emails and help texts
• API endpoints to create the message and the subject, which then can be edited by the user, and to send it via email
• fetchContact, sendContact, closeContact actions and a contactResolver for the Redux store
• QuestionContact (the button) and Contact (the modal) components

Resolves: #502

Screenshot:

[MyPyDavid]

maybe:

Suggested change

	If you have questions about a question or other inqueries to support, you can use the
	If you have a question or feedback please get in touch with us, you can use this form to send an email to the {{ request.site.name }} support"

or is it meant to be overwritten in the rdmo-app anyway?

[jochenklar]

I changed it, and yes it is supposed to be overwritten, but a good default does not hurt.

[jochenklar]

Ok, reabased and ready for review. I changed the questiomark to a speech-bubble but I am still not super happy with the icons. But I want to work on this when everything is merged.

[jochenklar]

Aaand found another unrelated with the end of the interview (b1a5da8)