Language detection and store

In UI texts we will use `i10n` (issue #395). Content (articles, news) will be on two langs:
- `Russian`
- `English`

### Default language detection

- For all visitors, default language is `English`
- For Russia, default is `Russian`

Module should detect Russian visitors and change default language to `Russian`. Most important parameter is **speed**

### Store default settings somewhere

### Change language selectors in templates:
- index page, block `News`
- article page