ENH: config: add local logic into config.load

JIRA: github-2569
Change-Id: If593b9faee324dda096a27873587db27aa22129e

src/libslic3r/Config.cpp

@@ -753,6 +753,9 @@ int ConfigBase::load_from_json(const std::string &file, ConfigSubstitutionContex
     std::list<std::string> different_settings_append;
     std::string new_support_style;
     bool is_project_settings = false;
+
+    CNumericLocalesSetter locales_setter;
+
     try {
         boost::nowide::ifstream ifs(file);
         ifs >> j;