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.
As mentioned in my last review please separate the checks for the blacklist in general and locales. Make the latter another if condition in the blacklist block. When we add more blacklist types later we can easily add one more if conditions, so we do not end-up with a huge list of conditions.