Save-a-theme tooltip copy change
Save-a-theme tooltip copy change

Fixes: CNVS-29278

Test plan:
- Important! Based on the big save-a-theme commit:
  https://gerrit.instructure.com/#/c/78163/
- Go to the main theme collection page
- Hover (or tab-focus) on the question-mark icon
  next to the Templates heading to trigger the
  popover.
- The text should now be what UX specified in the
  JIRA ticket:
  http://cl.ly/2A0w1g0G1y3o

Change-Id: I83a0a1801d36757cf8a0ad6646d1b824bb327e2c
Reviewed-on: https://gerrit.instructure.com/79679
Reviewed-by: Colleen Palmer <387ba1943871e60965e6b44638a2f2e1ab9b8469@instructure.com>
Product-Review: Colleen Palmer <387ba1943871e60965e6b44638a2f2e1ab9b8469@instructure.com>
Tested-by: Jenkins
QA-Review: Myller de Araujo <e5c7c5e1b7f2ce5e9870cc98ec52b20b3006cb48@instructure.com>

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