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 ‘Tabs Settings’ section.
Step 2Enable ‘Display Categories Tab’ from Display Tabs.
Step 3Change the ‘Category Tab title’ as you want to dispaly.

Category Tab Title

Step 4Save map and open it in browser.

Then you’ll see Map category title changed from frontend.

Map category Title

Video Tutorial