Since we use resources for the labels throughout Sitefinity, you will need to navigate to the section called Interface and Labels located under the Administration node.
In the control template the title is displayed as:
Text="<%$Resources: ForumsResources, ForumsTitle %>" runat="server" />
So you will need to search for the ForumsTitle. After you find it, you can change it to whatever you want. However keep in mind that you need to restart the application in order for the changes to take effect.
Please consider the attached screenshots.
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