The original poster is just wrong.

English is not the national language of the USA. There is no national language, and each state is free to choose the language or languages used in schools. Plenty choose both English and Spanish.

There are three official languages in the UK: Welsh, Irish and Scottish Gaelic. English, strangely, is not an official language as most people feel it doesn't require special protection. In Scotland, Wales and Northern Ireland, local languages are protected by law, with bilingual road signs, schooling and official documents being translated.