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The picture in the header does include slashed 0's though.

Edit: the pdf included in the download has both variants of 0, the slashed one at unicode point E007. So it seems it's up to the user to pick one.

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I imagine that a slashed zero would be used in places where both letters and numbers are possible, and a non-slashed one where only numbers are contextually expected. This seems to match the header picture: "5240N" uses a slashed zero, but all numbers-only indicators to the left are non-slashed.

I would assume this is true. In French (where Airbus comes from) 'West' is called 'Ouest'. "5240O" would be a pain.

On the other hand, in Danish and Norwegian, East is "Øst", making slashed zeros awkward together with compass directions. Dotted zeros would be better.

English is the universal language of aviation, so I'd expect the displays would be in English only.

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