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I think "merge" is the wrong word here. Not much of the EU server remains in the GB realm.
There's really no reason to use the latest EU client for translations, though, because they're outdated as well. If there are enough people interested in the patches to justify the large upload, I'll post them anyway (maybe interesting for people who like to archive files).
I would recommend using the base EU setup, diff/patch the stringtables with an automated tool and manually translate the missing entries (if necessary at all, many of the strings don't really appear in the game anyway).