P1B: Refactor (packages/web/src/i18n/locales.ts:98): Function with many returns (count = 7): matchLocale

### Uniqueness check

- [x] I have searched open issues and confirmed this **file + smell** is not already taken.

### Full path to the Typescript file

packages/web/src/i18n/locales.ts

### Function(s)/scope targeted

matchLocale()

### Relevant Qlty output

```shell
packages/web/src/i18n/locales.ts
  98  Function with many returns (count = 7): matchLocale
```