Work on code/documentation issues to improve the translations dashboard

[hturner]

@benubah, who supervised the Google Summer of Code projects producing the translations dashboard has opened several issues on the translations-dashboard repo with improvements that could be made. The dashboard was also reviewed under #50 leading to a further batch of issues for improvement.

This task is to review the open issues and select one or more to work on. There is a range of issues:

• Data analysis with R: e.g. https://github.com/r-devel/translations-dashboard/issues/11
• Refactoring R code: e.g. https://github.com/r-devel/translations-dashboard/issues/8
• Dashboard development: e.g. https://github.com/r-devel/translations-dashboard/issues/42
• Project documentation/governance: e.g. https://github.com/r-devel/translations-dashboard/issues/40

[hturner]

Another couple of issues to highlight:

• https://github.com/r-devel/translations-dashboard/issues/46
• https://github.com/r-devel/translations-dashboard/issues/47