When did groups of minorities residing in Hungary get alarmed by the pro-Magyar movement?

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Groups of minorities residing in Hungary got alarmed by the pro-Magyar movement when Magyar became Hungary's official language.
Key Takeaway: The Kingdom of Hungary was initially founded in 1000 by Stephen I of Hungary. At its founding, Hungary was a western Christian state, with Latin as the primary language (as was normal in the Middle Ages). In the 19th century, authorities began to implement a series of ethnic assimilation policies, known as Magyarization. These policies worked toward maintaining and/or imposing Hungarian culture and language. Most of Magyarization occurred among the middle classes, who had access to education. But groups of minorities residing within Hungary were also targeted and authorities hoped to compel people living within Hungary to adopt Hungarian culture and language.

When Did Groups of Minorities Residing in Hungary Get Alarmed