hook_language_fallback_candidates_alter(array &$candidates, array$context)
Allow modules to alter the language fallback candidates.
array $candidates: An array of language codes whose order will determine the language fallback order.
array $context: A language fallback context.
\Drupal\Core\Language\LanguageManagerInterface::getFallbackCandidates()
function hook_language_fallback_candidates_alter(array &$candidates, array $context) { $candidates = array_reverse($candidates); }
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https://api.drupal.org/api/drupal/core!modules!language!language.api.php/function/hook_language_fallback_candidates_alter/8.1.x