Function validateLanguageCode

validateLanguageCode(code: string): boolean
Determine if a language code is valid.
Parameters
- code: string
  The language code.
Returns boolean
- True if the language code is found in our list, false if it is not.
Example
```
validateLanguageCode("en"); // true
validateLanguageCode("zz"); // false
```
- Defined in utils/languages/index.ts:47