Translations: Make missing translations easier to identify

### Description

Clients are currently missing empty translation fields when reviewing the Translations section. This can lead to confusion when a form appears translated side-by-side in English and French, but the Translations section still shows a red X and prevents publishing.

Example client feedback:

> “My form is ready to publish but there's a red X on the Translations section and I don't know how to get rid of it. It's been translated and shows the English and French side by side. Thanks.”

We should improve the Translations experience so clients can quickly identify which fields are missing translations and understand what needs to be fixed before publishing.

### For example

> The translation review section remains problematic (with an X) despite me completing the translation of the survey. How can I publish the survey anyway or fix it?

### Support Tickets in June 2026:
https://cds-snc.freshdesk.com/a/tickets/28903
https://cds-snc.freshdesk.com/a/tickets/28810
https://cds-snc.freshdesk.com/a/tickets/28721
https://cds-snc.freshdesk.com/a/tickets/28681
https://cds-snc.freshdesk.com/a/tickets/28453
https://cds-snc.freshdesk.com/a/tickets/28438
https://cds-snc.freshdesk.com/a/tickets/28426
https://cds-snc.freshdesk.com/a/tickets/28404
https://cds-snc.freshdesk.com/a/tickets/29239

### July 2026:
https://cds-snc.freshdesk.com/a/tickets/29239