(1) The parties may agree on the language or languages to be used in the arbitral proceedings. Failing such agreement, the arbitral tribunal shall specify the language or languages to be used in the proceedings. This agreement or determination, unless otherwise specified therein, applies to any written statement by a party, any hearing, and any award, decision, or other communication by the arbitral tribunal.
(2) The arbitral tribunal may order that any documentary evidence be accompanied by a translation into the language or languages agreed upon by the parties or specified by the arbitral tribunal.