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I'll try to keep this article up-to-date. Please, help me to translate article to other languages. I saw French translation (I don't speak it, but I see that it's better than other translations), Esperanto (I don't speak it neither, but I saw some things are missing), but article in Romanian is allmost completely empty! I hope there will be volonteers to help to improve this article in other languages. Thank you in advance for any further help!