Have you tried loading the book as a kepub? The kepub reader on the device handles Arabic, Japanese, Chinese and other non-LTR languages. I believe with the right fonts installed, it works well. To test this, you can simply sideload an epub and change the extension to ".kepub.epub". That is enough to trigger the use of the kepub reader. But, that will miss some functions such as remembering the position in the book correctly. I recommend using calibre and the KoboTouchExtended driver to sideload the books. This will add the extra code to them needed to work correctly.
There has been plenty of discussion on this here. A search should find it.
The interface is another matter. You need to keep pestering Kobo to add other languages.
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