Function capitalize

capitalize(str: string, locale?: string): string
Capitalizes the first letter of a given string.
Parameters
- str: string
  The string to capitalize.
- locale: string = "en-US"
  Optional locale identifier for locale-specific case mapping (default is "en-US").
Returns string
The capitalized string.
Example
```
capitalize("hello world") // "Hello world"
capitalize("typescript") // "Typescript"
```
- Defined in string.ts:11