The union representing Argentine port-side grain inspectors said on Thursday it had ended a month-long wage strike after reaching a contract deal with export companies that will allow international soy, corn and wheat shipments to return to normal.The deal was struck after a marathon negotiation session with Argentina's private ports chamber on Wednesday. The work stoppage by the union, known by its Spanish acronym Urgara, started on Dec. 9 and had hit operations in key ports throughout Argentina…