We allow users to select locale variants when creating the help center
(e.g., pt_BR or en_UK). However, the selected variant may not always be
available for translation in the app. In such cases, we need to fall
back to either the base language or the default locale.
While this fallback logic was implemented for the portal locale, it was
missing for article locales.
This PR fixes that issue.
- Ensuring that SwitchLocale concern handles the case of custom domain for portals and set locale according to that
Co-authored-by: Sojan Jose <sojan@pepalo.com>
