A fork/expansion of the user script "Wikipedia 2 Wikiwand" <https://greasyfork.org/zh-TW/scripts/13400-wikipedia-2-wikiwand> to make the script applicable to most languages of Wikipedia (hopefully). Trying to do the similar thing to official browser addon/extentions of Wikiwand, an elegant and nicer frontend of Wikipedia.
Works great!
As long as Safari 12 is not allow any extension from outside of Mac App Store, This is the only choice for Safari & Wikiwand user.