Sync languages and arabic support

html/preferences.html

@@ -59,6 +59,7 @@
             <option value="uk">Українська</option>
             <option value="tr">Türkçe</option>
             <option value="vi">Vietnamese</option>
+            <option value="ar">اَلْعَرَبِيَّةُ</option>
         </select>
     </div>
     <br>

src/preferences.js

@@ -85,7 +85,7 @@ if (language) {
 function changeLanguage() {
 	const language = getId("select").value;
 	localStorage.setItem("language", language);
-	if (language === "fa") {
+	if (language === "fa" || language === "ar") {
 		rightToLeft = "true";
 		localStorage.setItem("rightToLeft", "true");
 	} else {