feat(template): add `lang` YAML front-matter data
feat(template): add `lang` YAML front-matter data

BREAKING CHANGE: Now you can define `lang` tag for your post, simply add `lang` to your post front-matter data, for example:

```
lang: ar
```

then define your own styles in `custom.less`:

```css
[lang=ar] {
  direction: rtl;
}
```

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