Internationalization and child template

Registering the text domain and then calling load_child_theme_textdomain() means it will load the textdomain from the ‘/languages’ folder of the child theme, if you follow the docs.

So, in your child theme’s lang files you’ll only need to include strings which are used in YOUR theme. If, however, you overwrite a parent-theme file/function, you’ll need to include those as well, and set them to your textdomain.