Can we use this on mobile?
As for the addon, on Android you'll need to install an unstable version of Firefox and configures a custom addon list in an addons.mozilla.org account that includes it so you can download it.
On iOS there isn't any option to download addons as far as I'm aware. On mobile Linux environments everything should work like on desktop.
The translation code itself should work on mobile. It's just some javascript & wasm (albeit with SIMD instructions not implemented in Safari's WASM vm…)
Sad to hear there's no such feature on iOS. At least Android gets uBlock Origin in the stable channels. Hopefully this will change when Apple will eventually be forced to permit other browsers into the iOS app store.