qmail invalid language file error

http://localhost/cgi-bin/vqadmin/vqadmin.cgi error in Qmail

invalid language file

vqadmin 2.3.6
vpopmail 5.4.13

If you get this error when running vqadmin.cgi, you must set your browsers language to en. Because ..cgi-bin/vqadmin/html/{your browser language like tr} file is doesn’t exist.

To solve this problem

In firefox type
about:config
and search for
general.useragent.locale
and change it to en

and search for
intl.accept_languages
and change it to en

and restart firefox.

Do not forget what did u do. After you use cgi script restore your settings.

———————
Another way: Delete your firefox end install english one.