Add temporary Wayback guard in _setLang

Add a short-term compatibility check in db/language::_setLang to support legacy Wayback calls: if version is the boolean false, the function returns null and aborts further processing. Comment notes this is temporary and will be removed.

db/language

@@ -15,6 +15,11 @@ function _isLangDetected() {
 }
 
 function _setLang(languageName, version) {
+    // WAYBACK SUPPORT; WILL BE REMOVED.
+    if (typeof version === "boolean" && !version) {
+        return null;
+    }
+
     // if "C/C++" already detected
     if (_isLangPresent("C/C++") && (languageName == "C" || languageName == "C++")) {
         _removeResult("language", "C/C++");