Gets the supported language pairs for this translator.
array List of language pairs where a pair is an associative array of source_language and target_language. Example: array( array('source_language' => 'en-US', 'target_language' => 'de-DE'), array('source_language' => 'en-US', 'target_language' => 'de-CH'), )
public function getSupportedLanguagePairs();