Merging W3Techs and InternetWorldStats numbers for 2019 Language content dominance and users statistics together, easy to see that there is a lot of potential for Arabic, Spanish and especially Chinese languages content development.
Other languages are a long tail of sub-2% users and content availability. Very stable Lingual users breakdown with strong dominance of English (changing from 58% to 55% over almost the last decade).
Salable and convenient language transformation tools and methods could close the shown gaps and leverage potential for the barely English-speaking countries.
Even though Wikipedia is also dominant by English articles, the distribution of languages there is slightly less polarized.
Here you can see that Swedish articles got outstanding 7.3% [2019] share for very small amount of users, generated by automatic translation bot, developed by Sverker Johansson, that received a lot of criticism, thanks to poor translation abilities of Google Translate. Something to think about…