feat: improve support for custom language names

### Is your feature request related to a problem? Please describe.

From Sara

> After installation I see 'Central Dusun (dtp-Latn-MY) - Kadazan' for the desktop keyboard? I haven't called the language 'Central Dusun', in fact this community want to be called 'Coastal Kadazan', which is what I have entered.

### Describe the solution you'd like

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### Describe alternatives you've considered

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### Related issues

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### Keyman apps

- [ ] Keyman for Android
- [ ] Keyman for iPhone and iPad
- [ ] Keyman for Linux
- [ ] Keyman for macOS
- [ ] Keyman for Windows
- [ ] Keyman Developer
- [ ] KeymanWeb
- [ ] Other - give details at bottom of form

### Keyman version

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### Operating system

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### Device

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### Target application

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### Browser

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### Keyboard name

_No response_

### Keyboard version

_No response_

### Language name

_No response_

### Additional context

_No response_