es_ES and ca_ES modifications

I had to manually reconcile two of Marc Bria's pull requests: 

es_ES for ojs-stable-2_4_5: https://github.com/pkp/ojs/pull/272
ca_ES for ojs-stable-2_4_5: https://github.com/pkp/ojs/pull/274

Everything should be in here and accounted for. I also checked and fixed copyright dates. Thanks, Marc, for your work!