If you have an iPhone or iPad, you can easily translate web pages in the Safari browser thanks to the Bing app and its action extension. Instead of cutting and pasting links or text, or switching apps, you can simply go to the page you want to translate, tap a couple of buttons, and watch as the the language changes right before your eyes.
The Bing Search app
You need the Bing app to use the Bing action extension in Safari for iPhone and/or iPad. Once you have it, you can throw it in a folder and forget about it.