Though it’s long been an everyday language, Letzeburgesch was only proclaimed Luxembourg’s national tongue in 1984. Meanwhile almost all Luxembourgers also speak French and German, the two other official languages, with many also fluent in English. Useful Letzeburgesch vocabulary includes moiem (hello), eddi (goodbye), gudd (good/delicious) and schein (beautiful). Thank you is ‘merci’, but with a stressed first syllable unlike in French.
Another language you'll hear widely is Portuguese: there's a huge immigrant community making up over 15% of the population. These 'Lusobourgers' first arrived as migrant labour in the 1960s.