Follow-up from "Add policy group scope to a drawer"

The following discussion from !162502 (merged) should be addressed:

• @rdickenson started a discussion:

              'All projects in %{groupsLength} group, with exclusions:',
              'All projects in %{groupsLength} groups, with exclusions:',

  @arfedoro suggestion:

  • Add a comma in this phrase because it could be misinterpreted as "All projects in groups that have exclusions".
  • Use "exclusions" because in a policy we use the word excluding, and "exclusion" is the noun form.