feat(previous departure feedbacks): presentation & edit done 🎉 | Tones of tweaks

Previous exchange feedbacks:

• renamed some fields
• added would recommend field in course feedback
• uniformaized grading scheme
• Added viewsets/serializers in the back (+permissions & performance concerns)
• Support edit in the front

Tweaks:

• directly return in the obj_info if the model is versioned or not
• Added support for required get parameters
• enum for model moderation level
• More versatile metric feedback component
• Fixed how the editor (frontend component) was telling if something has been moderated
• Added a CURRENT_USER variable instead of using the one from html directly
• Diminished website font-size
• Better proptypes / defaultProps in fields
• Added optionnal comment text on fields
• Fixed the number field
• Added Helper classes to centralize the manipulation of redux store data
• Teaked pseudo/username returned by the api

Closes #29 (closed) #32 (closed)