If you’re using Mastodon on an iPhone, you’re probably using the excellent Amaroq client. For some very good reasons, it doesn’t have a built-in feature to translate toots into your own language. That’s OK, though. We can implement that ourselves!
This will walk you through the process of installing Workflow on your iPhone, then configuring Amaroq to use it to translate toots from your timeline. There are a lot of steps here, but most of them are for the one-time setup. Don’t worry: you won’t have to do all of these every time you want to read something written in French.