Systemgebietsschema und Inhaltslokalisierung
The single canonical locale for this site. Drives date / number / currency formatting (PHP intl, CakePHP I18n, Faker), the admin UI translation language, and — for Pro sites using localized content fields — the default tab on render plus the fallback when a template requests a locale that has no content. Should be one of the available locales below when content localization is in use.
Pro: locale codes available for `localizedtext` and `localizedstyledtext` fields. Each code expands into a tab in the admin editor. Order matters: when a template asks for a bare language code like `en` and the data has both `en_US` and `en_GB`, the helper returns the first matching entry in this list. Pick from the autocomplete to ensure the label and direction (LTR/RTL) come from the registry.