Add $t to possible functions in preferences file

[unamix]

To add support for https://github.com/kazupon/vue-i18n
http://kazupon.github.io/vue-i18n/en/formatting.html#html-formatting

[christofferok]

Thanks for the pull request. I'm not that familiar with vue-i18n, but this change would only find the occurrences of $t, but the saved lang files would still be in the Laravel json format. Looking at the vue-i18n documentation it looks like it is expecting this type of format:

const messages = {
  en: {
    message: {
      hello: 'hello world'
    }
  },
  ja: {
    message: {
      hello: 'こんにちは、世界'
    }
  }
}

I think this is a little outside the scope of this project. Maybe you could fork the project and make a vue-i18n version?

[unamix]

I use https://github.com/martinlindhe/laravel-vue-i18n-generator to generate these formatted files from the regular lang files.