FreeBSD Port: www/firefox

[Holger Wagemann]

Dear Committer,

with firefox 59 the possibility to switch language has changed.
The behavior before was to modify value behind "general.useragent.locale"
The behavior now is to add new string "intl.locale.requested" and than 
modify language with a value like "de"
Could you add this information please? With  "pkg info -D" I cannot find 
any hint to this new behavior.
Thanks for your work and kind regards,
   Holger