[Resolved] Unable to map languages

		public function get_languages_supported_by_automatic_translations( $languageCodes, $sourceLanguage = null ) {
			$sourceLanguage = $sourceLanguage ?: Languages::getDefaultCode();

			$result = $this->requestWithLog(
				$this->endpoints->getLanguagesCheckPairs(),
				[
					'method' => 'POST',
					'body'   => [
						[
							'source_language'  => $sourceLanguage,
							'target_languages' => $languageCodes,
						]
					]
				]
			);

			return Maybe::of( $result )
			            ->reject( 'is_wp_error' )
			            ->map( Obj::prop( 'results' ) )
			            ->map( Lst::find( Relation::propEq( 'source_language', strtolower($sourceLanguage) ) ) )
			            ->map( Obj::prop( 'target_languages' ) );
		}

		public function get_languages_supported_by_automatic_translations( $languageCodes, $sourceLanguage = null ) {
			$sourceLanguage = $sourceLanguage ?: Languages::getDefaultCode();

			$lang_case_mapping = [
				'de_at' => 'de_AT',
				'de_ch' => 'de_CH',
				'de_li' => 'de_LI'
			];
			$languageCodes = array_map(function($code) use ($lang_case_mapping){
				return isset($lang_case_mapping[$code]) ? $lang_case_mapping[$code] : $code; 
			}, $languageCodes);

			$result = $this->requestWithLog(
				$this->endpoints->getLanguagesCheckPairs(),
				[
					'method' => 'POST',
					'body'   => [
						[
							'source_language'  => $sourceLanguage,
							'target_languages' => $languageCodes,
						]
					]
				]
			);

			$revert_lang_code = function($obj) use ($lang_case_mapping) {
				$lang_case_mapping = array_flip($lang_case_mapping);
				foreach ($obj as $key => $value) {
					if (isset($lang_case_mapping[$key])) {
						$obj->{$lang_case_mapping[$key]} = $value;
						unset($obj->$key);
					}
				}

				return $obj;
			};

			return Maybe::of( $result )
			            ->reject( 'is_wp_error' )
			            ->map( Obj::prop( 'results' ) )
			            ->map( Lst::find( Relation::propEq( 'source_language', $sourceLanguage ) ) )
			            ->map( Obj::prop( 'target_languages' ) )
			            ->map( $revert_lang_code );
		}