French, German, Russian. It's a pity English dominates so much. French reads beautifully. (Also if you read older papers by Hadamard, Stieltjes or Levy, the first thing you'll notice is their extreme honesty (they don't use difficult terms, they define everything, they don't try to make their arguments appear difficult) also calculations are not condemned nor indulged with (they often just write an equation and say in words how the rest of the computation goes)).
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