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language(<value[;value[;value[;...]]]>[,<default>])
Returns the value with the highest q-factor from a list as
extracted from the "accept-language" header using "req.fhdr".
Values with no q-factor have a q-factor of 1. Values with a
q-factor of 0 are dropped. Only values which belong to the
list of semi-colon delimited <values> will be considered. If
no value matches the given list and a default value is
provided, it is returned. Note that language names may have
a variant after a dash ('-'). If this variant is present in
the list, it will be matched, but if it is not, only the base
language is checked. The match is case-sensitive, and the
output string is always one of those provided in arguments.
The ordering of arguments is meaningless, only the ordering
of the values in the request counts, as the first value among
multiple sharing the same q-factor is used.
Example :
# this configuration switches to the backend matching a
# given language based on the request :
acl de req.fhdr(accept-language),language(de;es;fr;en) de
acl es req.fhdr(accept-language),language(de;es;fr;en) es
acl fr req.fhdr(accept-language),language(de;es;fr;en) fr
acl en req.fhdr(accept-language),language(de;es;fr;en) en
use_backend german if de
use_backend spanish if es
use_backend french if fr
use_backend english if en
default_backend choose_your_language