I can't conect the English article with the Bulgarian article

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Please help !! I don't know how to add the Bulgarian article about Lazarov ,in the field of the "Languages" https://bg.wikipedia.org/wiki/%D0%9C%D0%B0%D0%BD%D0%BE%D0%BB_%D0%9B%D0%B0%D0%B7%D0%B0%D1%80%D0%BE%D0%B2