Remove erroneous naming for things like TransactionEvent

[ejmg]

Description

Title mostly says it. From the earliest versions of the app, there was naming choices that were made largely off of misunderstanding the domain at the time. Transaction Events is a big example but there may be others. Removing these from the actual UI are a high priority but it would be good to remove any and all such names from the code base (validators, queried key names returned by the API, etc).