There is a setting in the text file "Local State" where Opera stores your location, we had a user in the old forums who had traveled to another country and returned who was getting a completely wrong version of Google - I suggested changing that setting and he said it worked.
Here is what it looks like in my settings:
"location": {
"country": "us",
"country_from_server": "US",
"timestamp": "1384558601600000000"
},
Not sure about the timestamp - he reported that it didn't seem to matter, so just try changing the other two as in my settings (for a US location you'd get google.com) and see what it does for you.
