The accept_language module picks a language for the request out of the
client's Accept-Language header and puts it into a variable, chosen from a
list the server can serve.  The weights decide: a client asking for English
and settling for German gets English, a language it refuses outright is
never chosen, and where it expressed no preference the server's list does.

This port only installs the module sources.  The module itself is built by
the nginx ports when their HTTP_ACCEPT_LANGUAGE option is enabled.
