Contacts: Move custom strings to cm_strings.xml

* These strings from the CMCC merge were missed, move them now.

Change-Id: If32f55c4ab5c77fd83de3c6772c179f80a69426a
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_packages_providers_ContactsProvider into cm-11.0