Environment::getLanguageKey() 

\nn\t3::Environment()->getLanguageKey(); 

Get the current language (as abbreviation like "de") in the frontend

\nn\t3::Environment()->getLanguageKey();
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| @return string

Source Code 

public function getLanguageKey () {
	$request = $this->getRequest();
	if ($request instanceof ServerRequestInterface) {
		$data = $request->getAttribute('language', null);
		if ($data) {
			return $data->getTwoLetterIsoCode();
		}
	}
	return '';
}
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