why the petitboot interface is no change after I change the *.po file.

[bajeer]

Respectful PB!
    There are some questions around me some days. After I add some tags in zh_CN.po file and then "make clean; make", the interface petitboot shows has nothing changed. The translation is old. Maybe it's because I use buildroot with petitboot. So I want get some advice from friendly petitboot. 
    Hope your answers.
    Respect!
bajeer
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