Swap source and target language with one click in translate popup

[batata]

When I browse reddit, no matter the sub I'm on, firefox translate always thinks the source is in french because it's the language of my UI. I wish I could swap source and target languages easily instead of selecting them from a list.

The same thing you can do on google translate with the <=> icon, it's very useful.

[Jon]

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[Tuńczyk]

Glad to see that there already is this thread concerning swap button implementation. 

At the same time, I'm disappointed that there are so few likes. This would be a very useful feature and, I suppose, not that hard to implement.