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German content is reachable at both /updates/foo and /de/updates/foo,
and a page with no English translation renders German at
/en/updates/foo through the fallback chain, so three URLs each
claimed to be canonical. Both tags now derive from one
locale-to-URL function, which points every duplicate at the address of
the version actually served, the unprefixed German URL, matching
default_url_options.
Alternates are declared only for locales in which the page genuinely has
a translation, since /en/ serving German through the fallback is not an
English version of the page. x-default points at German, the site's
primary language.
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