Don't make Everyone the default audience on Push

[DevBakura]

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Steps to reproduce

Open dashboard push section.
Go to send new push.
Everyone is selected as default audience.

Issue

Unfortunately today I made this mistake of sending a push to over 20k users.
To make is worse the push contained json as text.
This was clearly my fault. But I believe this can be prevented.

My suggestion is to don't have the audience selected to "Everyone" by default.
Or maybe require a confirmation window when sending a push to "Everyone" or over a X limit of users.

Also, and I think this is a bit more complex is to detect when the message contains json and is set to text. Maybe show a warning to the user.

[flovilmart]

Is it something you want to implement?

[DevBakura]

I don't know much about React, but I think I can give it a try.