language option does not work since it is not passed to Swift/Java codes

[jammind]

I found the language property is not passed to the native codes. I fixed it with the following changes.

Speech.js

    let language = options && options.language ? options.language : 'en-US' // Line 45
    exec(success, error, SPEECH, API_LIST.SPEAK_OUT, [message, pitchRate, speechRate, language]) // Line 46

Speech.swift

        var language = command.arguments[3] as? String ?? "en-US"  // Line 92
        speechUtterance.voice = AVSpeechSynthesisVoice(language: language) / Line 99

Speech.java

                Speech.this.speak(message, pitchRate, speechRate, language);  // Line 179