diff -Naur src/wp-content/themes/twentynineteen/image.php src/wp-content/themes/twentynineteen/image.php
--- src/wp-content/themes/twentynineteen/image.php	2018-11-12 23:20:52.000000000 +0530
+++ src/wp-content/themes/twentynineteen/image.php	2018-12-13 10:38:16.802061703 +0530
@@ -84,7 +84,7 @@
 					// Parent post navigation.
 					the_post_navigation(
 						array(
-							'prev_text' => _x( '<span class="meta-nav">Published in</span><br><span class="post-title">%title</span>', 'Parent post link', 'twentynineteen' ),
+							'prev_text' => sprintf( '<span class="meta-nav">%s</span><br><span class="post-title">%s</span>', __( 'Published in', 'twentynineteen' ), '%title' ),
 						)
 					);
 
diff -Naur src/wp-content/themes/twentynineteen/single.php src/wp-content/themes/twentynineteen/single.php
--- src/wp-content/themes/twentynineteen/single.php	2018-11-12 23:20:52.000000000 +0530
+++ src/wp-content/themes/twentynineteen/single.php	2018-12-13 10:37:21.481579317 +0530
@@ -27,7 +27,7 @@
 					// Parent post navigation.
 					the_post_navigation(
 						array(
-							'prev_text' => _x( '<span class="meta-nav">Published in</span><br/><span class="post-title">%title</span>', 'Parent post link', 'twentynineteen' ),
+							'prev_text' => sprintf( '<span class="meta-nav">%s</span><br><span class="post-title">%s</span>', __( 'Published in', 'twentynineteen' ), '%title' ),
 						)
 					);
 				} elseif ( is_singular( 'post' ) ) {