public LanguageManagerInterface::isMultilingual()
Returns whether or not the site has more than one language added.
bool TRUE if more than one language is added, FALSE otherwise.
public function isMultilingual();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Language!LanguageManagerInterface.php/function/LanguageManagerInterface::isMultilingual/8.1.x