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I would say it depends on the action of the button. When you are dealing with Calls to Action (CTA's) your primary emphasis is on communicating an action to an user as highlighted by this article about writing effective CTA's which has this to say : The very first piece of advice in the classic book Writing Tools encourages writers to start sentences ...
The "OK" text of a button normally refers to an action mentioned above in the form, that will usually be a dialog. For example a "Delete this thing" dialog's "OK" button means delete it, a verb. Actually, I prefer when the verb is in the button, no matter if it's repeated, because a fast user can check the action to take without needing to read the dialog ...
Prompts or dialogues where 'Ok' is an option are basically asking for the user's acknowledgement that they have received and understood the action they just made or the message in the prompt/dialogue. You could say by clicking the 'Ok', the user is 'Okaying' (hypothetical verb) when they click Ok. Or every 'Ok' could be changed to 'Acknowledge', though I ...
How about showing a dialog asking for gender at the first start of the app, saving it and then using that form?
Option 2. Better to be consistent in your writing, and tell the user what you're doing and why. I would choose the default gender based on other Hebrew writings that your users may have been exposed to.
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