Reload this Page perl: warning: Falling back to the standard locale ("C").
http://www.linuxquestions.org/questions/debian-26/perl-warning-falling-back-to-the-standard-locale-c-208709/mritch is correct.
you can also do it by:
#dpkg-reconfigure locales
choose your locale(s)
for example i choose all the en_US and the es_ES utf-8
in the next screen choose the one you want for your 'environment'
wait for to generate the locales and voilá
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