Rename Check List on Planning tab within Changes

Rename Check List on Planning tab within Changes

I would like to rename the Check List field on the Planning Tab within the Changes system. I have hunted around the system and cannot find the area within Admin for where to change this.
 
Our plan is to call it Testing so the change requestor can put the testing steps in there that they have completed prior to it being approved by either the CAB or the Change Manager.

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