However, when one writes in English, one should obey the English punctuation rules. The number should be written as 510.072.000 in a German or Polish text, but once the text is translated to English, the number gets "translated" too, yielding 510,072,000. Same goes with the long and short scales: English "134.5 billion" is French "134,5 milliard".

Same with the states having "Democratic" in their names. I'd prefer to live in the Republic of Korea rather than in Democratic People's Republic of Korea, and in Federal Republic of Germany rather than in German Democratic Republic.