KeDoRi cydia tweak detects the language of the text you are writing and automatically switches the keyboard with the right one (if you have setted this keyboard in the settings [settings.app->General->Keyboard]).
I think that’s the way iOS should manage multiple keyboard languages. I usually write both in italian and english and if I don’t remember to choose the right keyboard the autocorrection will change all my words.
No options to configure.
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