Bringing tens of thousands of employees back to the office during a pandemic is a huge task. Siemens, the 173-year-old German industrial giant, thinks an app can help.Since the COVID-19 pandemic hit, Siemens has raced to give its workplace app “Comfy” a makeover for the coronavirus era.Want to reserve an open desk as offices are rearranged for social distancing? Check. Need to locate your coworkers?