fix: Enhance LocalePicker dropdown with scroll and max height styling

[toviszsolt]

Why

The language selector's drop-down menu breaks the layout because there isn't enough vertical space on the screen to display all the languages. The drop-down is now scrollable, based on the official Tabler demo.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Code refactoring
• API changes
• Performance improvement
• Test addition or update

AI Usage

• AI was used to write this
• AI was used to review this

[Copilot]

Pull request overview

Improves the LocalePicker language dropdown so it won’t visually overflow limited-height viewports by constraining its height and enabling scrolling within the menu.

Changes:

• Adds a max-height (50vh) to the dropdown menu container.
• Attempts to enable vertical scrolling via an added CSS class on the dropdown menu.

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[toviszsolt]

All good. This is minor bug fix.

[nginxproxymanagerci]

Docker Image for build 1 is available on DockerHub:

nginxproxymanager/nginx-proxy-manager-dev:pr-5681

Note

Ensure you backup your NPM instance before testing this image! Especially if there are database changes.
This is a different docker image namespace than the official image.

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