Change Transactions Explorer data-group and type

I thought I'd changed these previously, but apparently I did not.

This commit changes:

- the data-group and data-type in all the stubs
- the script that creates the stubs
Merge pull request #423 from alphagov/bugfix-correct-data-endpoint-trans-exp

Correct data endpoint for Transactions Explorer dashboards
Re-generated the dashboards:

We now spell quarter correctly.

Updated the config for digital take-up.