Mix Language with Country
Using flags for language selection is not a good idea. Most languages are spoken in multiple countries, and some countries have multiple languages.
People from America will look for an American flag when seeing a Union Jack (British flag). When you have different content for different regions, it will be even more confusing.
Take this action
Try to avoid flags for language selection. Use text instead and don't translate the language.
Written by Jonas Kamber, Digital Product Nerd and UX Enthusiast since 1998.