Update lang.hpp

internal/lang.hpp

@@ -2,10 +2,15 @@
 #include <string>
 #include "json.hpp"
 
-
+/// RenderD7::Lang
 namespace RenderD7::Lang
 {
+    /// Get the 3ds System Language
     std::string getSys();
+    /// Get a translated string
+    /// key: The Key so the code can find your string
     std::string get(const std::string &key);
+        /// Load the lang file from dir structure en/app.json for sample
+        /// lang: the folder name en, fr, de ... . I prefer geSys()
 	void load(const std::string &lang);
-}
+} /// RenderD7::Lang