It should be possible to have support for multiple languages in a visualization mod.
The mod developer should be able to add text resources for multiple languages for UI texts used in the manifest or JavaScript code.
It would be nice if existing phrases would automatically be translated to the current language, for example when running Spotfire in German, "Color by" should be automatically translated to "Farben nach".
It would be very useful if you could use existing phrases from standard Spotfire so that you as a mod developer don't have to think about all the translations.
And I would expect that quite a couple of standard phrases like "Sort ascending" etc. would be very useful in mods.