Blogger detects the preferred language of the computer you are using when presenting you with the main page. That's nice. However, even after you log in to write a new post, it keeps using the same language. It would be a tad more user friendly if it switched to my preferred language at that point. Luckily, the interface is not too complex so I just learnt that
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Bejegyzés közzététele in Hungarian.
Update: There actually is a drop down box on the main screen that enables you to choose the language but it's not that obvious.