Hi.
Error 12 means you have run out of journal paper. replace the journal roll.
The language can only be changed when the machine is fully cleared back to factory specs, then you must re-program it. It would be best to take it to a dealer if you are not confident.
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If anyone needs a Casio TE-2000 manual,
http://the-checkout-tech.com/manuals/cashregisters/Casio4.php
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