Add new Rake task to simplify the compilation of PO files

doc/development/i18n_guide.md

@@ -233,8 +233,7 @@ Let's suppose you want to add translations for a new language, let's say French.
    containing the translations:
 
     ```sh
-    bundle exec rake gettext:pack
-    bundle exec rake gettext:po_to_json
+    bundle exec rake gettext:compile
     ```
 
 1. In order to see the translated content we need to change our preferred language

lib/tasks/gettext.rake

@@ -11,4 +11,12 @@ namespace :gettext do
       "{#{folders}}/**/*.{#{exts}}"
     )
   end
+
+  task :compile do
+    # See: https://gitlab.com/gitlab-org/gitlab-ce/issues/33014#note_31218998
+    FileUtils.touch(File.join(Rails.root, 'locale/gitlab.pot'))
+
+    Rake::Task['gettext:pack'].invoke
+    Rake::Task['gettext:po_to_json'].invoke
+  end
 end