What happens when the lang attribute is set incorrectly?

Spanish lang="es"

What will you do when the label comes off, And the plastic's all melted, And the chrome is too soft?

French lang="fr"

What will you do when the label comes off, And the plastic's all melted, And the chrome is too soft?

German lang="de"

What will you do when the label comes off, And the plastic's all melted, And the chrome is too soft?