Wis. Stat. § 757.18: Process, etc., to be in English.

All writs, process, proceedings and records in any court within this state shall be in the English language, except that the proper and known names of process and technical words may be expressed in the language heretofore and now commonly used, and shall be made out on paper or parchment in a fair, legible character, in words at length and not abbreviated; but such abbreviations as are now commonly used in the English language may be used and numbers may be expressed by Arabic figures or Roman numerals in the usual manner.