Change to one single configuration

[tflori]

The only injectables we want to have are the TranslateService and the TranslateConfig. In the TranslateConfig we also have to configure the TranslateLoader. The goal is to make configuration easier and external:

The config:

import {TranslateConfig, TranslateLoaderJson} from 'angular2-translator';

export const translateConfig = new TranslateConfig({
  defaultLang: 'de',
  providedLangs: ['de', 'en'],
  loader: TranslateLoaderJson,
  loaderConfig: {
    path: 'i18n',
    extension: '-lang.json'
  },
  modules: {
    'admin': {}
  }
});