Change HTML source language in Rise course

MarcinZarod​ thanks for the script. This is a bit experimental, but I've modified it to include adding RTL direction on the body tag (on html tag doesn't work) for Arabic and other rtl languages. Only tested on a regular scorm output.

<script>
(function () {
    try {
        const preferredLanguage = "ar"; // example

        // List of ISO language codes that use RTL direction
        const rtlLangs = ["ar", "he", "fa", "ur", "ps", "dv", "ku", "syr", "ug", "yi"];
        const langCode = preferredLanguage.split("-")[0].toLowerCase();

        function applyLangAndDir() {
            if (document && document.documentElement) {
                document.documentElement.lang = preferredLanguage;
            }
            if (document && document.body) {
                if (rtlLangs.includes(langCode)) {
                    document.body.setAttribute("dir", "rtl");
                } else {
                    document.body.setAttribute("dir", "ltr");
                }
            }
        }

        // Apply immediately
        applyLangAndDir();

        // Monkey-patch __fetchCourse so Rise receives the preferred language
        var origFetch = window.__fetchCourse;
        if (typeof origFetch === 'function') {
            window.__fetchCourse = async function () {
                var data = await origFetch();
                try {
                    if (data) {
                        if (data.labelSet && typeof data.labelSet === 'object') {
                            data.labelSet.iso639Code = preferredLanguage;
                        }
                        if (data.course && typeof data.course === 'object') {
                            data.course.locale = preferredLanguage;
                            if (data.course.defaultLocaleId == null || data.course.defaultLocaleId === 'en') {
                                data.course.defaultLocaleId = preferredLanguage;
                            }
                        }
                    }
                } catch (e) {
                    // ignore
                }

                // Re-apply after Rise loads its course data
                applyLangAndDir();

                return data;
            }
        }

        // Backup: watch for body changes and re-apply dir
        const observer = new MutationObserver(() => applyLangAndDir());
        observer.observe(document.body, { attributes: true, childList: true, subtree: false });
    } catch (e) {
        // ignore
    }
})();
</script>