`deploy-ui.mjs` does not support internationalised `angular` apps

The script `deploy-ui.mjs` fails when `src/ui/dist/ui/browser` contains multiple sub-directories.

This scenario can happen, for example, when trying to build multiple localised versions of the `angular` application using `@angular/localize`.

Start by reading deploy-ui.mjs and reproduce the failure with multiple sub-directories under src/ui/dist/ui/browser, as described in the issue. Trace how the script handles the generated Angular output; done means deployment succeeds for an internationalised app with multiple localised sub-directories.

Written by the indexing model from the issue text.