While a single "official report" for this specific tag isn't publicly generated as a standalone document, you can access the data it likely refers to through Mozilla’s public transparency and technical reporting tools.
The provides real-time updates on the completion status of Spanish language strings for the mobile app. es.mobile.firefox
If your report need is technical (e.g., performance or crashes), you can use these developer tools: While a single "official report" for this specific
: Provides a more granular look at desktop and mobile KPIs used by engineers. 3. Localization Status performance or crashes)