Unlike answers within the bot, Basic Campaigns do not auto-translate the content. This means that if a basic campaign is set up and you want it to be shown in non-English languages, it needs to have the content in alternate languages set manually. This can be done using the drop-down language selection on the right side above the Campaign message text entry box. If your Basic campaign is not showing up as expected on a non-English version of a website, ensure you have a manual translation setup for that language.
(example of language selection in Basic Campaigns)
Advanced Campaigns do not require this as their content is based on bot Answers which are compatible with the autotranslation feature.
If alternate languages have been added manually for the campaign in question, ensure that the language parameter is being correctly set in the Embed Script or the device's own system settings.