Hi all.
I don't own miband 3 (I have the Bip watch) but during the last weeks, I add Gadgetbridge app the ability to convert notification to show Hebrew/Arabic at the right direction.
I'm not sure how well it will be shown on a small screen, but it better than nothing.
It will be in Gadgetbridge next version, and in the meantime, you can use my private version from here:
Xiaomi Huami Amazfit Bip INTERNATIONAL