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We offer full support for multi-byte languages included in the core, including Japanese, Simplified and Traditional Chinese, Korean, etc 

We even have translation packages for these languages available in the addons section. Use these translation packages to enable the ImpressCMS user interface in additional languages.

This means that the people maintaining and managing your site can be working in their native language the whole time. The language on the web is primarily English, but ImpressCMS doesn't force you in that direction.