diff --git a/src/slic3r/GUI/OG_CustomCtrl.cpp b/src/slic3r/GUI/OG_CustomCtrl.cpp
index 4ff7e0778..579db938e 100644
--- a/src/slic3r/GUI/OG_CustomCtrl.cpp
+++ b/src/slic3r/GUI/OG_CustomCtrl.cpp
@@ -351,8 +351,6 @@ void OG_CustomCtrl::OnMotion(wxMouseEvent& event)
     wxString tooltip;
     std::string markdowntip;
 
-    wxString language = wxGetApp().app_config->get("language");
-
     // BBS: markdown tip
     CtrlLine* focusedLine = nullptr;
     // BBS
diff --git a/src/slic3r/GUI/Project.cpp b/src/slic3r/GUI/Project.cpp
index 1505ae8f0..814040f52 100644
--- a/src/slic3r/GUI/Project.cpp
+++ b/src/slic3r/GUI/Project.cpp
@@ -43,7 +43,7 @@ const std::vector<std::string> license_list = {
 ProjectPanel::ProjectPanel(wxWindow *parent, wxWindowID id, const wxPoint &pos, const wxSize &size, long style) : wxPanel(parent, id, pos, size, style)
 {
     m_project_home_url = wxString::Format("file://%s/web/model/index.html", from_u8(resources_dir()));
-    std::string strlang = wxGetApp().app_config->get("language");
+    wxString strlang = wxGetApp().current_language_code_safe();
     if (strlang != "")
         m_project_home_url = wxString::Format("file://%s/web/model/index.html?lang=%s", from_u8(resources_dir()), strlang);
 
diff --git a/src/slic3r/GUI/SendSystemInfoDialog.cpp b/src/slic3r/GUI/SendSystemInfoDialog.cpp
index 00dcf5d89..b8fe67dd2 100644
--- a/src/slic3r/GUI/SendSystemInfoDialog.cpp
+++ b/src/slic3r/GUI/SendSystemInfoDialog.cpp
@@ -437,7 +437,7 @@ static std::string generate_system_info_json()
     );
 #endif // __WXGTK__
     data_node.put("SystemLanguage", sys_language);
-    data_node.put("TranslationLanguage: ", wxGetApp().app_config->get("language"));
+    data_node.put("TranslationLanguage: ", wxGetApp().current_language_code_safe());
 
 
     pt::ptree hw_node;
diff --git a/src/slic3r/GUI/WebGuideDialog.cpp b/src/slic3r/GUI/WebGuideDialog.cpp
index da8edef9b..306b7494a 100644
--- a/src/slic3r/GUI/WebGuideDialog.cpp
+++ b/src/slic3r/GUI/WebGuideDialog.cpp
@@ -171,8 +171,8 @@ wxString GuideFrame::SetStartPage(GuidePage startpage, bool load)
         TargetUrl = from_u8((boost::filesystem::path(resources_dir()) / "web/guide/21/index.html").make_preferred().string());
     }
 
-    std::string strlang = wxGetApp().app_config->get("language");
-    BOOST_LOG_TRIVIAL(info) << __FUNCTION__<< boost::format(", strlang=%1%")%strlang;
+    wxString strlang = wxGetApp().current_language_code_safe();
+    BOOST_LOG_TRIVIAL(info) << __FUNCTION__<< boost::format(", strlang=%1%") % into_u8(strlang);
     if (strlang != "")
         TargetUrl = wxString::Format("%s?lang=%s", w2s(TargetUrl), strlang);
 
diff --git a/src/slic3r/GUI/WebUserLoginDialog.cpp b/src/slic3r/GUI/WebUserLoginDialog.cpp
index 9c47fae46..92c279758 100644
--- a/src/slic3r/GUI/WebUserLoginDialog.cpp
+++ b/src/slic3r/GUI/WebUserLoginDialog.cpp
@@ -37,25 +37,12 @@ BEGIN_EVENT_TABLE(ZUserLogin, wxDialog)
 EVT_TIMER(NETWORK_OFFLINE_TIMER_ID, ZUserLogin::OnTimer)
 END_EVENT_TABLE()
 
-string &replace_str(string &str, const string &to_replaced, const string &newchars)
-{
-    for (string::size_type pos(0); pos != string::npos; pos += newchars.length()) {
-        pos = str.find(to_replaced, pos);
-        if (pos != string::npos)
-            str.replace(pos, to_replaced.length(), newchars);
-        else
-            break;
-    }
-    return str;
-}
-
 int ZUserLogin::web_sequence_id = 20000;
 
 ZUserLogin::ZUserLogin() : wxDialog((wxWindow *) (wxGetApp().mainframe), wxID_ANY, "BambuStudio")
 {
     SetBackgroundColour(*wxWHITE);
     // Url
-    AppConfig * config   = wxGetApp().app_config;
     NetworkAgent* agent = wxGetApp().getAgent();
     if (!agent) {
         std::string icon_path = (boost::format("%1%/images/BambuStudioTitle.ico") % resources_dir()).str();
@@ -92,9 +79,9 @@ ZUserLogin::ZUserLogin() : wxDialog((wxWindow *) (wxGetApp().mainframe), wxID_AN
         TargetUrl = host_url + "/sign-in";
         m_networkOk = false;
 
-        std::string strlang = config->get("language");
+        wxString strlang = wxGetApp().current_language_code_safe();
         if (strlang != "") {
-            replace_str(strlang, "_", "-");
+            strlang.Replace("_", "-");
             TargetUrl = host_url + "/" + strlang + "/sign-in";
         }
 
diff --git a/src/slic3r/GUI/WebViewDialog.cpp b/src/slic3r/GUI/WebViewDialog.cpp
index 919699b96..b1b06756f 100644
--- a/src/slic3r/GUI/WebViewDialog.cpp
+++ b/src/slic3r/GUI/WebViewDialog.cpp
@@ -33,7 +33,7 @@ WebViewPanel::WebViewPanel(wxWindow *parent)
         : wxPanel(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize)
  {
     wxString url = wxString::Format("file://%s/web/homepage/index.html", from_u8(resources_dir()));
-    std::string strlang = wxGetApp().app_config->get("language");
+    wxString strlang = wxGetApp().current_language_code_safe();
     if (strlang != "")
         url = wxString::Format("file://%s/web/homepage/index.html?lang=%s", from_u8(resources_dir()), strlang);
 
@@ -505,7 +505,7 @@ int WebViewPanel::get_model_mall_detail_url(std::string *url, std::string id)
 {
     // https://makerhub-qa.bambu-lab.com/en/models/2077
     std::string h = wxGetApp().get_model_http_url(wxGetApp().app_config->get_country_code());
-    auto l = wxGetApp().app_config->get("language");
+    auto l = wxGetApp().current_language_code_safe();
     if (auto n = l.find('_'); n != std::string::npos)
         l = l.substr(0, n);
     *url = (boost::format("%1%%2%/models/%3%") % h % l % id).str();