fix(language-selector): update language selector to use select (#4335)

### Related Ticket(s)

#4330, #4331 

### Description

This change adds Carbon's `Select` component for the footer language selector in mobile/tablet breakpoints. Desktop views will continue to use `ComboBox`.

### Changelog

**Changed**

- `Footer` language selector now uses Carbon's `Select` instead of `ComboBox` for mobile/tablet breakpoints
- updated various styles for new component

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