l10n/en_GB: updated to latest extraction
l10n/en_GB: updated to latest extraction

Also:
Headline capitalization rules are applied, in contrast to Document Title Capitalization Rules, which US English also uses for headlines.


git-svn-id: eda3d06fcef731589ace1b284159cead3416df9b@9608 af82e41b-90c4-0310-8c96-b1721e28e2e2

jun66j5/trac-ja,walty8/trac,jun66j5/trac-ja,netjunki/trac-Pygit2,netjunki/trac-Pygit2,walty8/trac,jun66j5/trac-ja,jun66j5/trac-ja,netjunki/trac-Pygit2,walty8/trac,walty8/trac