I'm only seeing one language on these tablets. The multiple language systems are not implemented so be sure to talk to Samsung in your country about what languages come with your tablet.
Bob
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On my Samsung external BT keyboard attached to my Samsung Galaxy Tab S 10.5, when I press the "Lang" key, a pop up tells me that I have changed languages, and the on-screen keyboard displays and inputs that language, but when typing on the external keyboard, I only get English.

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