To change the categories tabs title according to your customization please do with following steps:
Step 1: Go to Add or Edit Map scroll down to the ‘Tabs Settings’ section.

Step 2: Enable ‘Display Categories Tab’ from Display Tabs.

Step 3: Change the ‘Category Tab title’ as you want to dispaly.

Step 4: Save the map and open it in a browser.
Then you’ll see Map category title changed from the frontend.