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This will depend on the type of instance your community is running.
For Jive Hosted (8/9): You should be able to customize this through a phrase substitution in your instance. For more information on phrase substitutions check out How to: Configure Phrase Substitutions
For Jive Cloud: This is not an available customization option in the current release, however if you are interested in seeing this added to a future release of the Jive Cloud platform I would suggest submitting an idea to the Ideas for Jive space where our Product team reviews through top rated ideas when considering features for future releases.