ports/78286: [PATCH] Add support for multilang for www/firefox

[=?gb2312?B?1dTQwg==?=]

I have sent permission requesting mail to zh-CN and zh-TW l10n team. I think
their will give us permission of ports, but ja-JP team, I am not sure, so
maybe I should cancel that port.

>Re: ports/78286: [PATCH] Add support for multilang for www/firefox
>
>If we commit this we need to make a knob in mozconfig.in to not enable 
>"ac_add_options --enable-official-branding"
>if LANG_PKGNAME is defined. Or we need to get
>permission from the locale mozilla team.
>
>http://www.mozilla.org/foundation/trademarks/l10n-policy.html
>
>Michael