The EASIEST way to #translate #mastodon on iOS/iPhone...
1. Install Bing (yes, that Bing)
2. Open Bing, login to Mastodon
On *any* of the timelines, including any posts/threads you expand...
3. Tap the share icon
4. Hit "Translate"
It literally auto-detects every language you can scroll to, and pretty quickly translates everything to your default language, in-place.
Switch languages using the top notification bar link.
It's so simple.