fix: amount in installment plan checkout block + update translation

[Benjamin-Freoua-Alma]

Reason for change

Linear task

Code changes

Our checkout block doesn't display the right installment plan. We fix it by changing the value in the plan by the total_amount of the installment

How to test

As a reviewer, you are encouraged to test the PR locally.

Install a new version of WooCommerce since 8.3.0
Enable the Block option in our module
Display the checkout page with an Alma plan with PnX installment. Check the amount of the installments

Checklist for authors and reviewers

• The title of the PR uses business wording, not technical jargon, for the changelog readers to understand it
• The PR implements the changes asked in the referenced task / issue
• You understand the impact of this PR on existing code/features
• Documentation is updated (API, developer documentation, ADR, Notion...)

Non applicable

• The automated tests are compliant with the testing strategy
• The tests are relevant, and cover the corner/error cases, not only the happy path
• The changes include adequate logging and Datadog traces

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud