Fix form validation message translations

[mwarman]

📢 Instructions

• Begin with a DRAFT pull request.
• Follow italicized instructions to add detail to assist the reviewers.
• After completing all checklist items, change the pull request to READY.

---

🔧 Change Summary

Describe the changes included in this pull request. Link to the associated GitHub issue(s).

• fixes Validation message using incorrect language #49
• Fixed the translation (i18n) of form validation messages so that if a user changes the language while viewing a form, the validation messages reflect the language change.

📝 Checklist

Pull request authors must complete the following tasks before marking the PR as ready to review.

• Complete a self-review of changes
• Unit tests have been created or updated
• The code is free of [new] lint errors and warnings
• Update storybook stories as needed
• Update project documentation as needed, README, JSDoc, etc.

🧪 Steps to Test

Describe the process to test the changes in this pull request.

1. Go to the landing page.
2. Set the language to English.
3. View the Sign in page.
4. Trigger a validation message (it should be in English.)
5. Change the language to Spanish.
6. Trigger a new validation message (it should be in Spanish.)

🔗 Additional Information

Optionally, provide additional details, screenshots, or URLs that may assist the reviewer.

• [...]