I find the problem....
Arduino IDE and the gcc - compiler uses UTF8 .... this means that some ASCII codes are replaced by 2 or 3 bytes sequences !
And this is exactly the characters I have received in my browser......
Maybe if the pages are put in the web using UTF8 charset, the problem can be resolved for Web output ?
But for the Oled and TFT, must be written some routine that intercepts the bytes, analize then, and replace for the original ASCII code and find the correct Font Table code to show as it must be showed ?