In the case of British English some well needed campaigned requests still are missing and they need to translate abit more phases (i gone through the ’134 phrases’

the education problem
preschool = nursery & reception
elementary = infant/ junior and primary [infant and junior combined]
high school = i know UK is the 51st US State LOL but they still use Secondary school (Grammar Comprehensive/ Academy/ specialist college)!
Further Ed: (16+) (College/ Post 16)
University (Undergraduate) = (lower) Grad School (BSc BA, BEd and hons)
University (Post Graduate) = Grad School (PHD etc)

zip vs postal code
cellphone vs mobile

^ they need to add support for these to be ‘translatable’ (as this the most annoying part for English GB users is the need to change not phases like add, Okay, Send thats is trival but facebook chooses to have them up for voting instead of more important education ones and a few others like E-Mail Address and Postcode, IM Address (not screenname [AIM legacy] – Yahoo and MSN is popular in europe and the UK not AIM) and the mentioning of color and favorite

I found it interesting reading http://en.wikipedia.org/wiki/American_and_British_English_differences as a brit and
it will be interesting when English GB/UK goes mainstream which English version gets used where (by new members)

there is a good chance the Commonwealth countries could go GB

one of the main changes mainly needed in a English Australia Facebook one would be G’Day (a greeting of hello)

Canada has a choice 2 strains of English and a version of French – English (US) [north american buddies], English GB (Commonwealth connections) and French

New Zealand likely use English GB again being in the commonwealth or English Australia [if one launched] as New Zealand English is similar to Australian

1 thing English US has over all the English versions is the dominance of American TV and the american language (E.g. Microsoft brings on MS Windows – particularly with the word Favorite)