// To go in config.json

"_languagePicker": {
    "_isEnabled": true,
    "title": "Language selection",
    "displayTitle": "Please select a language",
    "body": "This course is available in the following languages:",
    "_showOnCourseLoad": true,
    "_comment": "default class names are: icon-globe, icon-language-1, icon-language-2",
    "_languagePickerIconClass": "icon-language-2",
    "_restoreStateOnLanguageChange": false,
    "_languages": [
        {
            "_language": "en",
            "_direction": "ltr",
            "displayName": "English",
            "warningTitle": "Change language?",
            "warningMessage": "Changing the language will reset course progress.<br><br>Would you like to proceed?",
            "_buttons": {
                "yes": "Yes",
                "no": "No"
            }
        },
        {
            "_language": "de",
            "_direction": "ltr",
            "displayName": "Deutsch",
            "warningTitle": "Sprache ändern?",
            "warningMessage": "Ändern der Sprache wird den Fortschritt des Kurses zurücksetzen.<br><br>Möchte Sie fortfahren?",
            "_buttons": {
                "yes": "Ja",
                "no": "Nein"
            }
        }
    ]
}

// to be added to the _extensions object in course.json
"_languagePicker": {
    "navigationBarLabel" : "Select course language"
}