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If you knop which demo site version and relate version the site was based on you could download those versions to get the files. If not you could just do your own translations.
As Per Nergård said, these files are part of packages that you can download (demo templates and Relate+), but the demo package only have swedish and english translations and Relate+ only has english translations so you will have to do the translations yourself.
I have been assigned to update a project that previously has been built only to support english and swedish but now we have decided that we need to upgrade to french and german too. The problem is that we are using two old xml-files for languages that i can't find:
demo_EN.xml
relatePlusEN.xml
I need:
demo_DE.xml
relatePlusDE.xml
demo_FR.xml
relatePlusFR.xml
Anyone know where to find them?