New answers tagged internationalization
First visit Apple ID. Then click Mange your Apple ID, middle on the right of the page: Login and then click Language and Contact Preferences. Here you can select English US or English UK.
I had the same problem, and i finally solved it, Go to appleid.apple.com and set the preferred language for your account.
Nevron Writer for MAC has RTL support though its not perfect - https://www.nevronoffice.com/
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