de Dieser Benutzer spricht Deutsch als Muttersprache.
en-4 This user speaks English at a near-native level.
es-3 Este usuario puede contribuir con un nivel avanzado de español.
ru-3 Этот участник свободно владеет русским языком.
cs-2 Tento uživatel má středně pokročilé znalosti češtiny.
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I have a few edits here, most of them have been motivated by looking at extracted Wiktionary data for inconsistencies.

Additionally I am using the Wiktionary data to create open source language learning software, for example ebook reader dictionaries.