There are some languages that has a large number of speakers like Chinese, Hindi, Spanish, Arabic etc.
So, to have your translated pages in these languages means that you will gain the audience where these languages are used. Like the Chinese is used in China, Hindi used in India, Spanish is used in Spain and the Arabic is used in all the Arabic countries like Saudi Arabia, UAE, Kuwait, Qatar etc. The natives of Chinese speakers are more then 1100 million people. The Hindi speakers are about 700 million. So can imagine how big your business can grow if you use these languages. You need to get Wikipedia page translation services for every of the above language to gain a huge brand value in the world and to boost the sales.