Update Localizable.strings for minor copy change to Registration view

Changed "Activate This Device" to "Register" to be at parity with Signal Android
Changed one comment from "deactivated" to "unregistered"

Signal/translations/en.lproj/Localizable.strings

@@ -1214,7 +1214,7 @@
 /* message footer for read messages */
 "MESSAGE_STATUS_READ" = "Read";
 
-/* message status if message delivery to a recipient is skipped. We skip delivering group messages to users who have left the group or deactivated their Signal account. */
+/* message status if message delivery to a recipient is skipped. We skip delivering group messages to users who have left the group or unregistered their Signal account. */
 "MESSAGE_STATUS_RECIPIENT_SKIPPED" = "Skipped";
 
 /* message status while message is sending. */
@@ -1673,7 +1673,7 @@
 "REGISTRATION_VERIFICATION_FAILED_WRONG_PIN" = "Incorrect Registration Lock PIN.";
 
 /* No comment provided by engineer. */
-"REGISTRATION_VERIFY_DEVICE" = "Activate This Device";
+"REGISTRATION_VERIFY_DEVICE" = "Register";
 
 /* Message of alert indicating that users needs to enter a valid phone number to register. */
 "REGISTRATION_VIEW_INVALID_PHONE_NUMBER_ALERT_MESSAGE" = "Please enter a valid phone number to register.";