Adapt category generator to multilingual content
Adapt category generator to multilingual content

The category info will be obtained from a data file located at the
`source/_data` folder of the main Hexo project (not inside the theme). The file
must be named `categories.yml` (or .json) and should contain something like
this:

```
news:
  en:
    name: News
    slug: news
    category: news
  es:
    name: Noticias
    slug: noticias
    category: noticias
```

Built from 5a7c9c808ca7f6408bba1b3742a49c8b238e56e8.

ahaasler/hexo-theme-colos,ahaasler/hexo-theme-colos