Add blacklist for locales  (#309)

This is for issue #309. I added here the changes for the pulse script and also the blacklist for staging beta and release, for testing. So as discussed, the blacklist will have priority when there are both.
I can move this above, but the first if checks if we have a whitelist ( the "locales") but no blacklist and in the second if we have the blacklist it doesn't consider the whitelist anymore, so it will take priority.