2.8.1

Fixes

• Paywalls with translations now render in the user's language on first paint instead of briefly showing the default language.
• Paywall analytics events (paywall_open, paywall_page_view, paywall_close, etc.) now include a presentation_id, a unique identifier minted for each paywall presentation. Adds the previously-missing close_reason, cache_key, and build_id fields to these events, matching the data already sent by the iOS SDK.