Fixed two more locales-related issues

One warning was also fixed

src/libslic3r/AppConfig.hpp

@@ -178,7 +178,7 @@ private:
 	    auto it_val = it->second.find(parameter_name);
 	    if (it_val == it->second.end())
 	        return false;
-	    out = T(::atof(it_val->second.c_str()));
+        out = T(string_to_double_decimal_point(it_val->second));
 	    return true;
 	}