1. Go to Admin/Builders/Navigation Menu
2. Click the name in the blue action button you wish to change
3. In the Edit Dialog, copy the Language Key: _bx_ads_Ads
4. Go to Settings/Language Key from the side menu.
5. Copy the key into the Filter box and hit apply. Several names may appear but you should be able to figure out which one to select. If you choose the wrong one, just go back and change it. In the case of Ads, I think it's the first one.
6. Click the Edit link to the right of the key name.
7 In the Key Window, change the name in the section String Text For English Language.
8 Click Save
You May Need To Clear The Cache.