Index: src/slic3r/GUI/GUI_App.cpp
--- src/slic3r/GUI/GUI_App.cpp.orig
+++ src/slic3r/GUI/GUI_App.cpp
@@ -2075,6 +2075,7 @@ bool GUI_App::load_language(wxString language, bool in
         {
 	    	// Allocating a temporary locale will switch the default wxTranslations to its internal wxTranslations instance.
 	    	wxLocale temp_locale;
+		temp_locale.Init(); // https://docs.wxwidgets.org/trunk/classwx_locale.html#ab536c2c82f72f70e7c15e1091eb9e5cf
 	    	// Set the current translation's language to default, otherwise GetBestTranslation() may not work (see the wxWidgets source code).
 	    	wxTranslations::Get()->SetLanguage(wxLANGUAGE_DEFAULT);
 	    	// Let the wxFileTranslationsLoader enumerate all translation dictionaries for PrusaSlicer
