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This is probably not intentional - the data is from OpenStreetMap, and if you have a look at http://www.openstreetmap.org/ you'll see that there isn't an attempt to make all labels the same language.

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OSM has a policy that the base 'name' tag should be the name used on-the-ground locally, i.e. what appears in real life on street signs, building nameplates, and so on. Plus some special considerations for multilingual areas [1]. Items can also have additional language-specific tags (name:ja, name:en, etc.), which can in principle be used by renderers to display names in the language preference of the user, e.g. to produce an all-German-label or all-English-label map, to the extent the data is present [2].

[1] http://wiki.openstreetmap.org/wiki/Multilingual_names

[2] http://wiki.openstreetmap.org/wiki/Map_internationalization

I wasn't aware of that policy - thanks for noting it.

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