http module

Some definitions seems to use something like `http` module. For example, catberry-l10n:

``` typescript
_setLocaleToResponse(request: http.IncomingMessage, response: http.ServerResponse, locale: string): any;
```

We need to get what is it and set the typing right.

Search the TypeScript definitions for `http.IncomingMessage` and `http.ServerResponse`, beginning with the catberry-l10n declaration shown in the issue. Identify the intended `http` module typings, correct the declarations, and verify that the definitions type-check.

Written by the indexing model from the issue text.