Improve Nasqueron Join application form

Summary:
Improvements are in the following aspects:

• privacy section
• spacing
• parts name

Define permissions. French l10n.

Ref T1880

Test Plan: Fill it, read it

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1880

Differential Revision: https://devcentral.nasqueron.org/D3133