To remove MOD_VIRTUEMART_CART_CART_TEXT and MOD_VIRTUEMART_EMPTY_CAR_MSG and change them to englsih or your prefered language. Please add these to string to language override in Joomla 2.5 and 3.X
1. Go to Admin
2. Go to Extesnions - Language Manager
3. Go to "Overrides" (on the left in Joomla 3 and as "tab" in Joomla 2.5)
4. Click NEW and add the one of the MOD_VIRTUEMART_CART_CART_TEXT as constant and just write what you want this text to be. You can write anything you want. Some want to call it Shopping Bag and some Shopping Cart. Write what you like in your language.
If you have several languages you need to do this for all languages.