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Clicking on the "Browse" button in the menu, I see:
"Show sentence nº"
"nº" is not a valid abbreviation for numbers in English. "nº" is often used at least in French and Italian, but not in English. It should be "Show sentence #".
http://tatoeba.org/rus/users/all I see: Активные участники
Участники, сделавшие последние 400 '''дейтвий'''.(действий is correct)
Both are used, but # is more common.