Ohio Rev. Code § 2712.42: Language used in proceedings.

The parties may agree upon the language or languages to be used in the arbitral proceedings. If the parties do not reach such an agreement, the arbitral tribunal shall determine the language or languages to be used in the proceedings. Unless otherwise specified, the agreement or determination referred to in this section shall apply to any written statement by a party, any hearing, and any arbitral award, decision, or other communication by the tribunal. The tribunal may order that any documentary evidence be accompanied by a translation into the language or languages chosen pursuant to this section.