For non-Steam versions, the language is often selected during the initial installation process. If the game is already installed:
Launch the Ubisoft Connect desktop application. silent hunter 5 change language top
You need to download a file like "早期中文字库" and extract its Fonts folder directly into your Silent Hunter 5\data\Menu directory, overwriting the original files. This allows the game to render Chinese characters. For non-Steam versions, the language is often selected