Log In Change -- Get Rid of Toast

[thisjustin123]

Description:

Gregor, as a temporary implementation before design was finalized, implemented feedback for the login flow with toasts--LoginToast. We want to substitute this out for text on the button.

You should do the following, as Funmi specified:

• The login button should say "Logging in..." for a bit as it does right now.
• Whenever the Authenticating toast would show, change the button text to "Authenticating..." instead.
• Whenever the Successful Login toast would show, change the button text to "Successful Login!" instead.

[thisjustin123]

Blocked until design comes up with a better solution.