refs #5345, refs #3801
- Blog localisation
- default is `en` (English)
- you can change the language code in the admin panel, see https://github.com/TryGhost/Ghost-Admin/pull/703
- blog behaviour changes depending on the language e.g. date helper format
- theme translation get's loaded if available depending on the language setting
- falls back to english if not available
- Theme translation
- complete automatic translation of Ghost's frontend for site visitors (themes, etc.), to quickly deploy a site in a non-English language
- added {{t}} and {{lang}} helper
- no backend or admin panel translations (!)
- easily readable translation keys - very simple translation
- server restart required when adding new language files or changing existing files in the theme
- no language code validation for now (will be added soon)
- a full theme translation requires to translate Ghost core templates (e.g. subscriber form)
- when activating a different theme, theme translations are auto re-loaded
- when switching language of blog, theme translations are auto re-loaded
- Bump gscan to version 1.3.0 to support more known helpers
**Documentation can be found at https://themes.ghost.org/v1.20.0/docs/i18n.**
