'About datasets/orgs/groups' text is dreadful

The default text currently called things like "What are groups?" is totally unhelpful. Use the following instead.

About Groups

You can use CKAN Groups to create and manage collections of datasets. This could be to catalogue datasets for a particular project or team, or on a particular theme, or as a very simple way to help people find and search your own published datasets.


About Datasets

A CKAN Dataset is a collection of data resources (such as files), together with a description and other information, at a fixed URL. Datasets are what users see when searching for data.


About Organizations

CKAN Organizations are used to create, manage and publish collections of datasets. Users can have different roles within an Organization, depending on their level of authorisation to create, edit and publish.