- Added the EDXAPP_ACTIVATION_EMAIL_SUPPORT_LINK URL with default value [https://support.edx.org/hc/en-us/articles/227340127-Why-haven-t-I-received-my-activation-email-].
- Added the EDXAPP_ACTIVATION_EMAIL_SUPPORT_LINK URL with default value `''`.
- Role: edxapp
- Added the EDXAPP_SHOW_HEADER_LANGUAGE_SELECTOR feature flag with default value [false]