I've checked that issue a few month ago (based on Navision 4.0). There were no language moduls available which means that the W1-Client would have to be used. In terms of languages that can be licensed, I found many arabic languages (e.g. Microsoft lists "Arabic (Egypt)", "Arabic (Yemen)" etc. just to give some examples).
I assume that it should be possible to license such languages but you would have to take care of the translation yourself as no language moduls exists.
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I assume that it should be possible to license such languages but you would have to take care of the translation yourself as no language moduls exists.
Don't know if this is the final truth ...