Change Keyboard Layout in Xterm

Change "XkbLayout" in /etc/X11/xorg.conf

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Section "InputDevice"
    Identifier  "Keyboard1"
    Driver      "Keyboard"
    Option "AutoRepeat" "500 30"
    Option "XkbRules"   "xfree86"
    Option "XkbModel"   "pc105"
    Option "XkbLayout"  "de"
EndSection

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Switch of beep at xterm
Add "xset b off" into .bashrc or /etc/profile