(1) The parties are free to agree on the language or languages to be used in the arbitral proceedings. Absent such agreement, the arbitral tribunal determines the language or languages of the proceedings. The agreement by the parties or the determination by the arbitral tribunal governs, unless otherwise provided for therein, the written declarations submitted by a party, the hearings for oral argument, arbitral awards, other decisions and other communications by the arbitral tribunal.
(2) The arbitral tribunal may order that any documentary evidence must be accompanied by a translation into the language or languages that the parties have agreed on or that the arbitral tribunal has determined.