Feature: ng-add add translation to project

[kyubisation]

We provide the translation files for german, french and english. We would like to automatically add these the the i18n section in the angular.json, if it is available.

      "i18n": {
        "locales": {
          "de-CH": {
            "translation": "src/i18n/messages.de-CH.xlf",
            "baseHref": "/de/"
          }
        },
        "sourceLocale": {
          "code": "en-CH",
          "baseHref": "/en/"
        }
      },

to

      "i18n": {
        "locales": {
          "de-CH": {
            "translation": [
              "src/i18n/messages.de-CH.xlf",
              "node_modules/@sbb-esta/angular/i18n/xlf/messages.de-CH.xlf"
            ],
            "baseHref": "/de/"
          }
        },
        "sourceLocale": {
          "code": "en-CH",
          "baseHref": "/en/"
        }
      },

DoD:

• Rule implemented in ng-add, which converts the i18n entries to arrays or simply add the appropriate translation files
• Check if xlf or xlf2 is used
• Skip if no i18n entry is found
• Be aware of the various formats the i18n section can have

[jeripeierSBB]

We are currently considering writing an importer for angular-t9n.