Feature: internationalizing

  Scenario: Default language follows the device locale on first launch
    When the app launches
    Then the language is set to the device locale

  Scenario: Invalid stored language falls back to the device locale
    Given stored preferences contain theme {sepia} and language {xx}
    When the app launches
    Then the language falls back to the device locale

  Scenario: Supported languages are available
    Then the app supports languages {en, zh-TW, es}