passwords.properties not loaded

[luixxiul]

Describe the issue you encountered: passwords.properties is not applied.

Expected behavior: It should be loaded.

• Platform (Win7, 8, 10? macOS? Linux distro?): macOS
• Brave Version: master branch
• Screenshot if needed:

- Any related issues: #3671 #1858

[bbondy]

there is no password.properties only a passwords.properties

[bbondy]

found it we aren't using the translated string,

[bbondy]

I don't think we have a way to dynamically get strings in about: pages yet.

data-l10n-id works there, but the string that need to get the value dynamically I think don't:
https://github.com/brave/browser-laptop/blob/master/js/about/passwords.js#L137

It needs to use confirmClearPasswords

/cc @aekeus @bridiver