Workers at Germany’s Postbank branches nationwide plan to stage a two-day strike beginning on Friday amid collective bargaining talks with the bank. The trade union Verdi, which represents Postbank employees, on Thursday called on about 12,000 unionized workers to join the strikes aimed at forcing a better offer from the bank, including larger salary increases. Postbank is a subsidiary of German banking giant Deutsche Bank. “The employees expect long-term job guarantees and clear material appreciation for their work and the particular burdens of recent months,” Verdi negotiator Jan Duscheck sa…