I think the easiest way to do this, (assuming that you only want to change certain keywords across the Space), is to export the Space to XML from the Space Admin, edit the text of the entities.xml file in a text editor using "Find+Replace" and then re-import the Space back into the instance.
However, you should first try re-importing the edited Space into a test instance to make sure that the changes have been made successfully and there are no problems before you re-import that Space into your production instance.
All the best,
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG