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1: I did a blunder actually. The tenancy contract copy of the place where I'm staying at was in Arabic and I failed to attach a translated copy. Can this be a reason enough for Visa rejection?
Yes, it can be a reason. An untranslated document is like something you never sent to them. They don't have your tenancy contract.
2: During my application online I failed to realize that my wife had to make another application. I only realized later during my appointment at VFS when they took my biometric prints only. So I quickly made an application for her using the premium lounge and told them to combine the application. Since my wife does not work or have any funds and I will be funding her expenses. I did mention this in her application. Will this cause any issues?
No, there are a lot of spouses that don't work and are supported by their partners. However your lack of research on the application process might translate to lack of a strength in your application.
3: I have attached my friend's email and wedding card. Is that sufficient?
Not on their own.
I guess I'm having post submission anxiety as stated in other posts. But I don't want the visa to be rejected after all the hard work. Please help
You're right ;)