Seams to work if you replace in parent theme all the words with the name of you child theme.
I do not know if this it the correct solution but you can try.
Replace the red word from parent theme
<?php _e('Premium Listings','osclasswizards');?>
With this
<?php _e('Premium Listings','osclasswizards_child');?>
osclasswizards_child = the name of your child theme.
Or you can copy all the files from parent theme in your child theme and you can rename that word only in child theme.
This works for me but how i told you i do not know if this is the correct way.