Translations not returning translated strings

Getting tired so mistakes creep in that I don’t see. I totally missed the fact that my sprintf strings are missing the domain name. I copied the code directly from the wordpress core files, and these code don’t include any domain name. So this is the fix: Change

'must_log_in'          => '<p class="must-log-in">' . sprintf( __( 'You must be <a href="https://wordpress.stackexchange.com/questions/133681/%s">logged in</a> to post a comment.' ), wp_login_url( apply_filters( 'the_permalink', get_permalink( $post_id ) ) ) ) . '</p>',

to

'must_log_in'          => '<p class="must-log-in">' . sprintf( __( 'You must be <a href="https://wordpress.stackexchange.com/questions/133681/%s">logged in</a> to post a comment.', 'pietergoosen' ), wp_login_url( apply_filters( 'the_permalink', get_permalink( $post_id ) ) ) ) . '</p>',

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