New answers tagged globalization
For what it’s worth, the plus sign is probably more universally understood than the concept of shopping cart / basket / bag. It does not necessarily mean ‘Add X to Y’, however, but ‘Increase Amount of X’ – by 1 if not indicated otherwise – which may include automatic addition of another X to Y, especially if there is already at least 1 X in Y. Where amounts ...
While the plus icon may be widely understood as "add", I would say it's a big risk to rely solely on it without any context. If localization is not feasible, my inclination would be to test an icon that shows a plus or arrow with a cart next to it, and also make this a very strong CTA using color/size/layout.
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