Localization: Updated internal dictionaries

+ Fixed localization marker in GCodeViewer

src/slic3r/GUI/GCodeViewer.cpp

@@ -3971,7 +3971,7 @@ void GCodeViewer::render_legend(float& legend_height)
       const auto custom_it = std::find(m_roles.begin(), m_roles.end(), GCodeExtrusionRole::Custom);
       if (custom_it != m_roles.end()) {
           const bool custom_visible = is_visible(GCodeExtrusionRole::Custom);
-          const wxString btn_text = custom_visible ? _u8L("Hide Custom G-code") : _u8L("Show Custom G-code");
+          const wxString btn_text = custom_visible ? _L("Hide Custom G-code") : _L("Show Custom G-code");
           ImGui::Separator();
           if (imgui.button(btn_text, ImVec2(-1.0f, 0.0f), true)) {
               m_extrusions.role_visibility_flags = custom_visible ? m_extrusions.role_visibility_flags & ~(1 << int(GCodeExtrusionRole::Custom)) :