(AMEND) Gruntfile: Build jquery-ui.js using requirejs

- Uglify bundle;
- Rename uglify.main to uglify.bundle, so there's no confusion with requirejs's
  generated main file;
Wrap I18n files with UMD jqueryPlugin
Gruntfile: Build jquery-ui-i18n.js using requirejs

- Rename s/all/bundleJs or s/bundle/bundleJs when appropriate to avoid confusion
  with bundleI18n;