- Updated Wagtail hooks to use gettext for translatable strings in the NewsletterCampaignViewSet and related help texts.
- Added LOCALE_PATHS to settings for loading translation files.
- Updated base.html to include favicon links.
- Translated various strings in the wagtailsettings edit template to support internationalization.
- Created and populated zh_Hant translation files for Django messages.
- Added a favicon.ico file to the static directory.
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