If you’ve synced "My Contacts" group from Gmail contacts list, please, look for the contacts from this group in "Contacts" group in Address Book on Mac.
The fact is that "My contacts" group is a system group and contacts from this group will be synced to "Contacts" group in Address Book on Mac no matter which localization you’ve selected for Google account.
The following system groups from Gmail contacts list are not localized and synced to Mac under their English names, as well:
- Friends
- Family
- Coworkers