Russian to infamous Soviet dictator.
Spanish to liquefied timepiece creator.
English to songsmith with capital name.
French to one whose end in Waterloo came.
What are we listing?
I think the answer is:
Foreign language or, maybe, not their mother's tongue
Russian to infamous Soviet dictator.
Josef Stalin was Georgian, so Russian is not his first language
Spanish to liquefied timepiece creator.
Dali, author of the liquefied clocks was Catalan, again Spanish is not his first language
English to songsmith with capital name, courtesy of @MOehm
Irving Berlin, composer (born Israel Berlin (Russian: Израиль Моисеевич Бейлин)), mother tongue Russian, but lived in USA
French to one whose end in Waterloo came.
Napoleon, who lost the battle at Waterloo, was born on the island of Corsica to an Italian family, so again French was not his first language.
There’s a
Language tag, which makes me think of something to do with translations....
So a partial answer follows:
Russian to infamous Soviet dictator.
As identified by @AHKieran, this is Josef Stalin. Stalin is a Russian word meaning STEEL.
Spanish to liquefied timepiece creator.
This is painter Salvador Dalí. Although Dalí doesn’t have a Spanish translation I don’t think, Salvador does, and it’s SAVIOUR.
English to songsmith with capital name.
Not sure, but if their last name is a capital city I’d imagine it would also be a METROPOLIS.
French to one whose end in Waterloo came.
As identified by @AHKieran, this is Napoléon Bonaparte. As a Corsican, Bonaparte has a French/Italian/Corsican translation of GOOD SOLUTION or GOOD MATCH.
Putting all these together, and coming up with a solution undoubtedly far from @jafe’s intended one, we have
Steel, Saviour, Metropolis, Good Solution.
That can only lead us to
SUPERMAN.
Are you listing:
Languages and famous people who spoke them?
Russian to infamous Soviet dictator
Josef Stalin
Spanish to liquefied timepiece creator
Not sure
English to songsmith with capital name
Paris Hilton???
French to one whose end in Waterloo came
Napoleon Bonaparte