Update public/index.html, public/js/paperfilter.js

public/index.html

@@ -459,6 +459,16 @@
   <script src="js/vendor/parallax-js/dist/parallax.min.js"></script> -->
   <!-- <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> -->
 
+  <!-- language selection script -->
+  <script>
+    var lang_new = "1";
+
+    $('.selectpicker').change(function(){
+        lang_setting = $(this).val();
+        language(lang_new);
+    });
+  </script>
+
   <script src="js/jquery-3.1.1.min.js"></script>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.6.2/js/bootstrap-select.min.js"></script>
   <script src="./js/popper.min.js"></script>

public/js/paperfilter.js

@@ -6,7 +6,7 @@ var state2019 = 0
 var stateall = 0 
 var state = 0
 var count = 0
-var lang_new= lang_setting
+
 
 function filter(year){