score:2
Short answer: the quantity of chocolate you bring to Austria for private consumption is not restricted.
Long answer: I looked up the information on the Austrian Ministry of Finance's website. The English version is regretably short but the German original states the following:
Basically there are quantity limits for food you bring to Austria, even if it's for private consumption. There is a list with maximal quantities of restricted goods. If you stay within these quantities, you don't need any papers for these goods nor declaring them.
Russia is among "other" countries of origin on this list with the following limitations (for precise wording and explanation of different mentioned food groups, please refer to the German original in PDF):
As you see, nobody cares for your chocolate unless it's mainly made of meat, milk or cheese :)