Tweak copy to remove remaining uses of sign up (#7987)

* tweak copy in Deactivated.tsx

* tweak copy in Policies.tsx

* tweak comment in createNativeStackNavigatorWithAuth.tsx

* tweak copy in LoginForm.tsx

* tweak copy in StarterPackLandingScreen.tsx

* format

* Apply suggestions from code review

Co-authored-by: Hailey <hailey@blueskyweb.xyz>

* Update src/screens/StarterPack/StarterPackLandingScreen.tsx

Co-authored-by: surfdude29 <149612116+surfdude29@users.noreply.github.com>

* Update src/screens/StarterPack/StarterPackLandingScreen.tsx

Co-authored-by: surfdude29 <149612116+surfdude29@users.noreply.github.com>

---------

Co-authored-by: Hailey <hailey@blueskyweb.xyz>

src/screens/Signup/StepInfo/Policies.tsx

@@ -103,7 +103,9 @@ export const Policies = ({
 
       {under13 ? (
         <Text style={[a.font_bold, a.leading_snug, t.atoms.text_contrast_high]}>
-          <Trans>You must be 13 years of age or older to sign up.</Trans>
+          <Trans>
+            You must be 13 years of age or older to create an account.
+          </Trans>
         </Text>
       ) : needsGuardian ? (
         <Text style={[a.font_bold, a.leading_snug, t.atoms.text_contrast_high]}>