Fallback langauges section has out of date info
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In FAQ#What_is_a_fallback_language? there is a link to the table for fallback languages. The page linked to is obsolete and in fact references a script php maintenance/language/checkLanguage.php
that no longer exists (see https://gerrit.wikimedia.org/r/c/mediawiki/core/+/585481 ). The preferred method now to check fallback languages is to look at languages/messages/Messages<lang_code_here>.php and check the setting of $fallback
.