For some reason, certain GTK+ packages such as xfce-mcs-plugins have strings like "Button Label|Display". This is an error which will be displayed verbatim in the application(s) concerned. The solution is to remove the prefix "Button Label|" from your translated version.
I have filed this as a bug: https://launchpad.net/distros/ubuntu/+source/xfce-mcs-plugins/+bug/75351 -- "The less I have to do with customers, the better. I've always felt that the biggest contribution the commercial vendors do is exactly the fact that they end up being the interface between customers and developers, and that they also thus end up being the balance between purely technical issues and the purely marketing thing. And open source keeps them (and the developers, for that matter) honest." - Linus Torvalds, 21 December 2004
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