* Replace hardcoded sent ether label on confirm screen
* replace transaction type SENT_ETHER with network agnostic SENDING_NATIVE_ASSET
* remove sentEther translation base
* make backwards compatible with lingering transaction of legacy sentEther type
* update localalization files
* fixup legacy sentEther transaction type
* changing new transaction type away from localization string
* revert migration tests
* update fixtures and test data
* update name of new transaction type
* add migration
* remove legacy SENT_ETHER from transaction types enum object
