When importing calendar events in Webtop5, you'll get an import wizard that is just working fine. Anyway, there's a button which has like an internal naming, it seems, and one wouldn't really know what to to with it. See screenshot
Thank you @tboston, evidently they have escaped some labels in the translation.I report to @gabriele_bulfon and @matteo.albinola for correction
Thank you for the report! @tbostonIt will be fixed in the next release!