If you go into commerce manager and the market management where you setup your market you set the master language of that market but you can also add additional languages, you can then access these from the Market objects
You cannot set price language wise. Because there is no use case that currency/price will be different for different language. Price can vary by Market, Valid range or Customer group.
Or is it something else you want to achieve with pricing?
This might help: webhelp.episerver.com/latest/en/commerce/markets/markets.htm
"A single site can have multiple markets, each with its own product catalog, language, currency, and promotions. The market determines which products and prices a customer sees on the website. When creating a market, you can define a geographic entity (such as region, a country, a group of countries)."
How to set multiple price/currency for a variant in multiple language? I can set multiple price/currency for markets but cannot assign market to particular language.