Small tweaks for adding a new application member:

- raise specific invitation type if invite not found in invitation domain classes
- more terse assignments of defaults in invitation service, smh
- terser margin expression for inline input fields
- sass formatting
- use translation for cancel link
- oxford comma for app team management permission explanation
- do not format environment roles with hyphens for role selection
- generalize some additional methods in the invitation domain base class
- use plain atst.models import path

tests/domain/test_invitations.py

@@ -152,9 +152,9 @@ def test_lookup_by_user_and_portfolio():
     ws_role = PortfolioRoleFactory.create(user=user, portfolio=portfolio)
     invite = PortfolioInvitations.create(portfolio.owner, ws_role, user.email)
 
-    assert PortfolioInvitations.lookup_by_portfolio_and_user(portfolio, user) == invite
+    assert PortfolioInvitations.lookup_by_resource_and_user(portfolio, user) == invite
 
     with pytest.raises(NotFoundError):
-        PortfolioInvitations.lookup_by_portfolio_and_user(
+        PortfolioInvitations.lookup_by_resource_and_user(
             portfolio, UserFactory.create()
         )