Fix bug choosing locale with region suffix

Remove old JS form validations (#1867) ...

* added new form validation error handling

added tests for orgs controller

converted over remaining controllers to new errors

enhanced message handlers in application controller

finished form validations

* fixed rubocop for all controllers

* Fix broken specs

- Factories needed to be updated to meet new validation requirements
- Spec was broken since error message had changed

* Fix errors and warnings from npm audit

Refactor routes for better maintainability ...

- Remove redundant routes (Fixes #1699, Fixes#1570)
- Remove redundant actions
- Remove redundant policy methods
- Fix invalid actions (public methods defined on controllers)
- Set concern methods as private
- Extract session locale method from ApplicationController into its own controller
- Explicitly define actions in statics controller for better readability