Merge branch 'fix-management' into 'master'

app/assets/javascripts/management.js

app/assets/javascripts/management/complaints.js

app/controllers/management/complaint_reasons_controller.rb

app/controllers/management/complaints_controller.rb

app/controllers/management/statistics_controller.rb

app/models/complaint_reason.rb

app/views/management/complaint_reasons/_form.html.erb

app/views/management/complaint_reasons/edit.html.erb

app/views/management/complaint_reasons/index.html.erb

app/views/management/complaint_reasons/new.html.erb

app/views/management/complaints/index.html.erb

app/views/management/statistics/complaints.html.erb

app/views/management/users/admins.html.erb

app/views/management/users/curators.html.erb

app/views/management/users/index.html.erb

app/views/shared/management/_nav_menu.html.erb

config/routes.rb