Enhancements to transaction history

[tjanez]

Send transaction:

Delegate transaction:

• I would suggest renaming the title to:
  • "Delegated 99,999.0 TEST"
• I would suggest renaming "Validator" to "To" and showing a validator's name instead of account address if the address is for a known validator with an entity in metadata registry. The validator's name could be a link to a page with more info about it (link to block explorer?) or to go under "Active delegation" tabs for that validator?
• Should the validator's avator also be shown somewhere?

Undelegate transaction:

• Same suggestions as for the Delegate transaction.

[Esya]

Splitting this into two separate issues and closing this one :

#89 - I'll change Validator and To to Account to avoid misleading issues
#90 - This will be further down the line as there are multiple possible implementations for this (possibly actually fetching the metadata registry myself instead of relying on the explorer)