After conversations in T107747, here are the suggested changes:

Change:

• String: platform (clients would specify "desktop", "mobile web", "app" etc)
• String: platform version (clients would specify "alpha", "beta", "stable", "prototype", etc)

With:

• String: platform (clients would specify a value from an enum)
• String: presentation (clients would specify: for the web, the skin name; for apps the form factor and the stage (i.e., {tablet|phone|wearable}-{stable|beta|alpha|prototype}) such as "tablet-alpha"))

• "platform" will be a mandatory enum value with "web", "androidapp", and "iosapp" as options.
• "presentation" is an optional string, as described just above.

Add a "userLanguage" field, that will contain the user's UI language (see T107747#1547265 and T107747#1548098)

AC:

• Schema contains platform and presentation with the descriptions mentioned above
• Schema has removed the old platform and platform version fields
• Schema has a field for the user's UI language (the language in which the survey was shown).