mkdocs-material/src/partials/language.html

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<!-- Import translations for given language -->
{% import "partials/language/" + config.theme.language + ".html" as lang %}

<!-- Import fallback translations -->
{% import "partials/language/en.html" as fallback %}

<!-- Re-export translations -->
{% macro t(key) %}{{ {
  "direction": config.theme.direction
}[key] or lang.t(key) or fallback.t(key) }}{% endmacro %}