add description_short to person

app/controllers/admin/university/people_controller.rb

app/models/university/person.rb

app/models/university/person/administrator.rb

app/models/university/person/alumnus.rb

app/models/university/person/author.rb

app/models/university/person/researcher.rb

app/models/university/person/teacher.rb

app/views/admin/university/people/_form.html.erb

app/views/admin/university/people/_main_infos.html.erb

app/views/admin/university/people/static.html.erb

config/locales/university/en.yml

config/locales/university/fr.yml

db/migrate/20220401105007_add_description_short_to_person.rb

db/schema.rb