The post, category, tag and author descriptors keep one entry per
enabled locale but give a locale a URL only when the record has content
in it: posts and categories by their own translation (a translated slug
alone is no content), tags and authors when one of their published
posts is translated into it, the default locale always. Without content
the entry's URL is "", so hreflang and the sitemaps never advertise an
untranslated locale. The menu item types' Resolve is unchanged.
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