Remove old (an unused?) lane to download localizations

I say unused because I couldn't find a call to it in the existing
automation, even prior to my recent localization improvement changes,
c991e2a

Up till then, the `finalize_release` lane called the release toolkit
`ios_update_metadata` action. There also isn't any mention of the lane
in the release scenario:
https://github.com/Automattic/mobile-toolbox/blob/f103711d97f2b26ef63cb5626c01daf712cce307/ios/wcios-release-scenario.sh#L89

Author: mokagio

fastlane/Fastfile

@@ -766,79 +766,6 @@ platform :ios do
     )
   end
 
-  desc 'Download App Store Translations'
-  lane :download_app_store_translations do
-    files = {
-
-      # Metadata fields
-      'app_store_desc' => { desc: 'description.txt' },
-      'app_store_keywords' => { desc: 'keywords.txt' },
-      'app_store_subtitle' => { desc: 'subtitle.txt' },
-      'app_store_promo_text' => { desc: 'promotional_text.txt' },
-      'whats_new' => { desc: 'whats_new.txt' },
-
-      # Screenshots
-      'app_store_screenshot-1' => { desc: 'app_store_screenshot_1.txt' },
-      'app_store_screenshot-2' => { desc: 'app_store_screenshot_2.txt' },
-      'app_store_screenshot-3' => { desc: 'app_store_screenshot_3.txt' },
-      'app_store_screenshot-4' => { desc: 'app_store_screenshot_4.txt' },
-      'app_store_screenshot-5' => { desc: 'app_store_screenshot_5.txt' }
-    }
-
-    metadata_locales = GLOTPRESS_LOCALES
-
-    gp_downloadmetadata(project_url: 'https://translate.wordpress.com/projects/woocommerce%2Fwoocommerce-ios%2Frelease-notes/',
-                        target_files: files,
-                        locales: metadata_locales,
-                        source_locale: 'en-US',
-                        download_path: './fastlane/metadata')
-
-    # Ensure that localizations are present in the right places (some locale codes aren't correct)
-    {
-      'ar' => 'ar-SA',
-      'de' => 'de-DE',
-      'es' => 'es-ES',
-      'fr' => 'fr-FR',
-      'nl' => 'nl-NL',
-      'zh-cn' => 'zh-Hans',
-      'zh-tw' => 'zh-Hant'
-    }.each do |source, destination|
-      source_dir = File.join(Dir.pwd, 'metadata', source)
-      Dir.children(source_dir).each do |file|
-        source_file = File.join(source_dir, file)
-        destination_file = File.join(Dir.pwd, 'metadata', destination, file)
-        FileUtils.mv(source_file, destination_file)
-      end
-      FileUtils.remove_dir(source_dir)
-    end
-
-    # Copy source files into `en-US`
-    enUS_path = File.join(Dir.pwd, 'metadata', 'en-US')
-
-    FileUtils.mkdir_p(enUS_path)
-
-    [
-      'promo_screenshot_1.txt',
-      'promo_screenshot_2.txt',
-      'promo_screenshot_3.txt',
-      'promo_screenshot_4.txt',
-      'promo_screenshot_5.txt'
-    ].each do |filename|
-      source = File.join(Dir.pwd, 'appstoreres', 'metadata', 'source', filename)
-      destination = File.join(enUS_path, filename)
-      FileUtils.cp(source, destination)
-    end
-
-    # Replace the `default` directory with the contents of `en-US`
-    default_path = File.join(Dir.pwd, 'metadata', 'default')
-    FileUtils.remove_dir(default_path) if File.directory?(default_path)
-    FileUtils.copy_entry(enUS_path, default_path)
-
-    # Never store review information (it contains passwords and PII)
-    review_info_path = File.join(Dir.pwd, 'metadata', 'review_information')
-    FileUtils.remove_dir(review_info_path) if File.directory?(review_info_path)
-  end
-
   desc 'Create Promo Screenshots'
   lane :create_promo_screenshots do |options|
     unless Fastlane::Helper::GitHelper.has_git_lfs