By Jonathan Stempel NEW YORK (Reuters) – Barclays Plc was sued on Friday in a proposed U.S. class action in which shareholders claimed they were defrauded in connection with the British bank’s sale of $17.6 billion more debt than regulators had allowed. A complaint filed in the U.S. District Court in Manhattan by two Florida pension plans seeks to hold Barclays responsible for declines in the prices of its American depositary receipts (ADR)as costs mounted over the blunder. The complaint said Barclays made “materially false and misleading” assurances in its annual reports that its internal con…