Fix discover page breadcrumbs title

What does this MR do and why?

What

Fix discover page breadcrumbs title

Why

Fixes a translation issue in breadcrumbs title

References

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Before	After

How to set up and validate locally

1. Setup GDK to simulate SaaS
2. Create a new top-level group.
3. Go to admin panel and edit the group to apply the Ultimate plan.
4. Add a duo pro trial to that namespace in the rails console

n = Namespace.last
add_on = ::GitlabSubscriptions::AddOn.where(name: ::GitlabSubscriptions::AddOn.names[:code_suggestions]).last
::GitlabSubscriptions::AddOnPurchase.create(add_on: add_on, namespace: n, quantity: 1, started_at: Time.current, expires_on: 30.days.from_now, purchase_xid: SecureRandom.hex(16), trial: true, organization_id: 1)

3. Navigate to http://localhost:3000/groups/#{your-test-group}/-/add_ons/discover_duo_pro

Related to #502468 (closed)