Support alert dialogs (#1401)
Support alert dialogs (#1401)

Add support of the `Open assessment unit` in the mobile.
edx/edx-app-ios,edx/edx-app-ios,edx/edx-app-ios,edx/edx-app-ios,edx/edx-app-ios,edx/edx-app-ios,edx/edx-app-ios