Suunto EON Core and Suunto EON Steel currently support 17 languages: English, Simplified Chinese, Dutch, Finnish, French, German, Italian, Korean, Norwegian, Polish, Portuguese, Russian, Spanish, Swedish, Danish, Czech and Japanese.
See more about changing the language:
EON Core:
Suunto EON Core - How to adjust basic settings (video)
Suunto EON Core user guide section: Language and unit system
EON Steel:
Suunto EON Steel user guide section: Language and unit system