This is exactly the experience I use frequently on Twitter. I can read and write basic Japanese but I'm not good at it so I like that the UI gives you the option to request it.

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Discussion

For all languages or just Japanese?

For Asian languages I prefer the behavior of no auto translation but to have the button to feed a particular post into the translator. I'm not alone in this.

For Spanish I'd like the opposite. Auto translate is OK but I want the button to flip it so I maybe I can learn a word.

One of the reasons for this usage preference is because Asian language auto translation is often far worse than for European languages.