Add option to change shutdown/reboot keys (#487)

Include options in the configuration to change which function keys to use for shutdown and reboot.
Fix config.map_len size in src/config.c.
Add missing defaults in config_defaults() in src/config.c.

res/lang/ro.ini

@@ -34,12 +34,12 @@ err_perm_user = nu s-a putut face downgrade permisiunilor de utilizator
 
 
 
-f1 = F1 opreşte sistemul
-f2 = F2 resetează
 login = utilizator
 logout = opreşte sesiunea
 numlock = numlock
 password = parolă
+restart = resetează
 shell = shell
+shutdown = opreşte sistemul
 wayland = wayland
 xinitrc = xinitrc