Fix setSelect2() to also run when changing languages

Author: ishikawa999

app/views/custom_message_settings/edit.js.erb

@@ -1,3 +1,4 @@
 $('#edit-custom-messages').html("<%= j (render 'custom_message_settings/messages', lang: @lang) %>");
 $('#default-messages-link').replaceWith('<%= open_default_messages_window_link(@lang) %>')
+setSelect2();
 $('#ajax-indicator').hide();