fix: add six and seven bedrooms - #6493

This PR addresses #6458

• Addresses the issue in full
• Addresses only certain aspects of the issue

Description

Adds six and seven + bedrooms options.
Using google translate for this seemed wrong (as it returned inconsistent translations), so i used common sense and some AI so i cant guarantee if they are correct.

How Can This Be Tested/Reviewed?

run migration.
Units should have now 2 new options.
they will be visible on public listing site.

Author Checklist:

• Added QA notes to the issue with applicable URLs
• Reviewed in a desktop view
• Reviewed in a mobile view
• Reviewed considering accessibility
• Added tests covering the changes
• Made corresponding changes to the documentation
• Ran yarn generate:client and/or created a migration when required

Review Process:

• Read and understand the issue
• Ensure the author has added QA notes
• Review the code itself from a style point of view
• Pull the changes down locally and test that the acceptance criteria is met
• Either (1) explicitly ask a clarifying question, (2) request changes, or (3) approve the PR, even if there are very small remaining changes, if you don't need to re-review after the updates