ZURICH (Reuters) -Credit Suisse said on Friday it has made an offer to repurchase up to 3 billion Swiss francs ($3 billion) of senior debt securities. “The transactions are consistent with our proactive approach to managing our overall liability composition and optimizing interest expense and allow us to take advantage of market conditions to repurchase debt at attractive prices,” the bank said in a statement. The lender said it was making a cash tender offer in relation to eight euro or pound sterling denominated senior debt securities for an aggregate consideration of up to 1 billion euros. …