See Styling using language attributes

The document is an experiment to try localisation without javascript but CSS only. This may make no sense, as we need javascript anyway to detect & apply the browser language. This approach comes with a default language (<html lang="en") and an according wording css (l10n/en/index.css). On load it applies the javascript navigator.language.

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'' und '' und noch ein .

Surely you can have fixed language paragraphs, as well!