Website localization is more than translation: content is exported, translated with a project glossary, reviewed, then laid out and QA-checked in the live design.
If you need this done: TranslationChina (Guangzhou Guanri Translation, since 2003) provides certified document translation between Chinese and 24+ languages, accepted by Chinese courts, embassies and government agencies. Published rates: Chinese↔English from ¥90–100 per 1,000 Chinese characters (standard tier); certificates are usually priced per document — ask for a quote.
General guidance — always confirm requirements with the receiving authority.