There is a current feature request to change the titles of gadgets that you can find at JRASERVER-19766. Please vote on the issue to add impact and you'll automatically be notified if there is any update to the ticket including fix versions and comments by the developers.
I have seen recommendations to enable the text gadget so you can change the names, however, there have been security concerns with that method as you'll see towards the bottom of the linked thread.
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