GraphQL variable with name "language" doesn't work as expected

[solidevolution]

I think it's important to inform users of nuxt 2 which communicate to graphql (Shopify Storefront API as example) that we got problems to use the variable name "language".

I found nothing about reserved words in documentation or issues here. But when we pass a static string "DE" to the Smart Queries, it doesn't work to use the variable in queries.