You may be interested in an earlier post on /r/linguistics, The word "okay", which gets into a bit of the history of the word. The short of it is that, after gaining popularity in English it spread to other languages with the spread of American pop culture.

Some quick history from Etymology Online:

1839, only survivor of a slang fad in Boston and New York c.1838-9 for abbreviations of common phrases with deliberate, jocular misspellings (such as K.G. for "no go," as if spelled "know go;" N.C. for "'nuff ced;" K.Y. for "know yuse"). In the case of O.K., the abbreviation is of "oll korrect."