Mo. Rev. Stat. § 476.050

All writs, process, proceedings and records in any court, and in all inferior tribunals established by law, 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 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 customary way. Notwithstanding the foregoing, such writs, processes, proceedings and records may be filed, submitted, stored and maintained in an electronic format or otherwise in the manner provided by supreme court rule.