Twitter's PWA application, in the Store and on the web, has been upgraded again, server-side. This happens every month (here's last month's) and a couple of changes have been noticed - the option to have a tweet auto-translated by Microsoft's APIs, plus the auto-appearance of a 'Reply' control rather than 'Compose' when viewing someone else's tweets in an expanded view. As usual, these PWA tweaks apply to the app in a browser on any desktop or - here - to the official Store application (a packaged PWA app) for Windows 10 Mobile.
Here's screenshot proof of the new Twitter PWA version:
Note that when Twitter notices that a tweet is in a language other than your own, it offers to 'Translate Tweet'. Tap this and the tweet is fired off to Microsoft Translate's APIs, returning almost instantly (around a second, the APIs are probably licensed and hosted on Twitter's servers?) with a translation attempt.
Notice also the bottom right UI control in the screenshots - it's to fire off a 'reply' rather than 'compose', the latter icon is of a feather and a '+' sign, implying scribbling something new. This is an obvious UI tweak and saves having to find and tap one of the much smaller reply controls in-line, should you just wish to reply to the thread generally and not to a specific existing reply.