The game - though described and advertised in various languages - is actually only released in: English, German, Russian, and Italian(
i think) versions.
Meaning: when you load the game, your menu options will be in one of those languages -
provided you bought a HARD COPY (=disk). Otherwise - and in spite of the fact that the APPLE App store advertises in country~specific languages - you are only given the English version of Machinarium when you download the game.
i Can't explain to you why that is.
However if you can figure out what "LOAD" or "QUIT" is in the language you are looking at... you
can play Machinarium.
(and if you can't manage that, then go ahead and ask us here on this forum)