app provisioning Step 3 changes

- rearrange markup in the template
- include text from translations

translations.yaml

@@ -340,6 +340,7 @@ portfolios:
       step_2_description: "Production, Staging, Testing, and Development environments are included by default. However, you can add, edit, and delete environments based on the needs of your Project."
       step_2_button_text: "Save and Add Members"
       step_3_header: Invite Members to {application_name}
+      step_3_description: "To proceed, you will need each member's email address and DOD ID. Within this section, you will also assign application-level permissions and environment-level roles for each member."
       step_3_button_text: Save Application
     create_new_env: Create a new environment.
     create_new_env_info: Creating an environment gives you access to the Cloud Service Provider. This environment will function within the constraints of the task order, and any costs will be billed against the portfolio.