CORE-4646 Added Public App Warning to AppIntegrationWindow.

Refactored I18N to extend the I18N class from the ui-resources-module.
Updated AppIntegrationWindow to set its window header to the App name with the editPublicAppWarning message and a help tool button with editPublicAppHelp text.
Added min width and height to AppIntegrationWindow to keep it a minimum usable size.