Make /metrics downloads more descriptive of what is happening

[tdlowden]

User Story

In order to better represent what is offered, data provider wants to rename the /metrics file download section

Acceptance Criteria

the “Most Downloaded Datasets” section should really read “Most Downloaded Dataset Files

Background

“Thanks for sending that along. That is a nice little public record of the details. It looks like the “Most Downloaded Datasets” section should really read “Most Downloaded Dataset Files. It appears to specific to individual files for published datasets and not an aggregated count of the downloads from each dataset as the title seems to suggest. But who am I to argue with somebody who is doing this for us.”

Security Considerations (required)

None

Sketch

• Change H2 for downloaded files table to "Most Downloaded Dataset Files"