One step left after installing
Translation happens in the Safari extension. After install you still have to switch it on once. Three steps, one minute.
Open Settings and find Safari
Go to Extensions and turn on BelliedMonkey Translator
Set permissions to Allow, for All Websites
Come back to this page once it is on — it turns green by itself, no refresh needed.
The paragraph below is in English. Tap the floating button at the bottom right; it should turn bilingual immediately.
Spaced repetition works because forgetting is not a failure of memory but a property of it. Each time a memory is retrieved just before it would have slipped away, the interval until the next review can be stretched further.
The sentences you actually stopped to read are the ones worth keeping. The ones you scrolled past are not.