Orders are assigned a language, allowing emails sent to the customer to be in this language.
Note: the emails are translatable in the Strings translation panel.
The language information is provided, for example, to allow the shop owner to send order notes in the customer’s language. When the admin language filter is not activated and displays ‘Show all languages’, all orders in all languages are visible.
If you are in charge to treat the Spanish orders, activate the admin language filter with ‘Spanish’. You will see only the orders in Spanish and the language column won’t be displayed anymore.
When editing an order, the language is visible in a metabox which allows you to send your order notes in the customer’s language.