Improve UX/UI onboarding for dApp

[0xDbec]

User Story

Acceptance criteria

1. Select Hub screen: to be divided in 2 parts**
   a. First part: Add token to UDC contract

• Change the naming to: Enable Raiden Network Services
• Only keep the Balance of RDN tokens + replace 'download' icon with a '+'
• Add short explanation as to what RDN is used for (Consult Dina if needed)

2. Select hub

• Change naming to: Open channel
• Current token balance: to be shown as big as the current RDN token Balance in previous screen + add ‘balance of the tokens’ (just as Under RDN balance)
• Make that current token balance clickable
• Disable option of entering own address when selecting hub

Tasks

[0xDbec]

Improvement based on UX/UI dApp testing results at EthCC:

See 'key takaways' + 'improvement suggestions'.