Banks are open from 8.30 to 14.00. Shops are open from 9.30 to 14.00 and 16.00 to 20.00. Department stores and a few shops do not close at lunchtime. Although Barcelona is a bilingual city, signs and street names are only in Catalan. You should not have any problem but knowledge of French helps.
Old people are better at French while young people are better at English.
For the wise Like every city of some size, Barcelona has its security problems. Nothing to worry about excessively, but it is a good idea to leave your passport, plane ticket and other valuables in the hotel. Do not carry more money on you that you need.