Be able to adjust the text on the partnership page

[nicolelaine]

Is your feature request related to a problem? Please describe.
Right now, on the Tasking Manager tab of the new partnership page, when no projects are listed, there is a default text of "There are no current projects."

You can see this at this link here:
https://tasks.hotosm.org/partners/marshmclennan/stats/leaderboard

Screenshot here:

Describe the solution you'd like
This would be extremely helpful to be able to adjust. For example, it could say: "Please visit https://web.mapswipe.org/ to find a project to map. Remember to join the {partner group name on MapSwipe} group to ensure that your statistics will be included as part of your organisation. Happy Mapping!"