added more instructions into tuto computer

tutos/computer.txt

@@ -31,10 +31,14 @@
 **youtube-dl for france.tv :**
 	https://github.com/ytdl-org/youtube-dl/issues/29956#issuecomment-1013345689
 
-**remap keyboard keys for one session :**
+**remap keyboard keys :**
+	/* FOR ONE SESSION */
 	**xev** open a program that gives informations about key events, like keycode
 	**xmodmap -pk | grep <keycode>** to find the name of the key, like Return
 	**xmodmap -e "keycode <keycode> = <name>"** ex: `xmodmap -e "keycode 62 = Return"`
+	/* OR FOREVER */
+	**sudo cp /usr/share/X11/xkb/symbols/pc /usr/share/X11/xkb/symbols/pc.bak** save the file
+	**sudo vim /usr/share/X11/xkb/symbols/pc** modify the file
 
 **settings of firefox extension MultiTranslate :**
 	iframe {