BeamX DAPPS: Transaction confirmation dialogs.

[alexandrashelenkova]

Add transaction confirmation for dapps https://zpl.io/ag5dKOM https://zpl.io/adQ5EYE

All states for dapps transaction confirmations are here https://zpl.io/adQ5Ewp

[sinaizd]

@alexandrashelenkova need to change the text to

[AndreyDyakonov]

1. When we withdraw BEAMX to the wallet - in transactions confirmation dialog need change icon, asset name and amount (it displays incorrectly)

2. When "Ask for password on every Send" switch is enabled add the field for entering password with text: "To approve the transaction please enter your password"

Look like in desktop:

[AndreyDyakonov]

When we withdraw BEAMX to the wallet - in transactions confirmation dialog - if there is no exchange rate, then the amount should be empty (there should be no characters too)

[AndreyDyakonov]

Checked