{% set lang_pth = "languages/" ~ locale ~ ".html" %} {% if lang_pth is existing_template %} {% import lang_pth as lang %} {% import "languages/en.html" as fallback %} {% macro t(key) %}{{ lang.t(key) or fallback.t(key) }}{% endmacro %} {% else %} {% import "languages/en.html" as lang %} {% macro t(key) %}{{ lang.t(key) }}{% endmacro %} {% endif %}