Index: wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php
===================================================================
--- wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php	(revision 39543)
+++ wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php	(working copy)
@@ -321,7 +321,7 @@
 		$term = get_term( (int) $request['id'], $this->taxonomy );
 
 		if ( ! $term || $term->taxonomy !== $this->taxonomy ) {
-			return new WP_Error( 'rest_term_invalid', __( "Term doesn't exist." ), array( 'status' => 404 ) );
+			return new WP_Error( 'rest_term_invalid', __( 'Term does not exist.' ), array( 'status' => 404 ) );
 		}
 
 		if ( is_wp_error( $term ) ) {
@@ -374,7 +374,7 @@
 			$parent = get_term( (int) $request['parent'], $this->taxonomy );
 
 			if ( ! $parent ) {
-				return new WP_Error( 'rest_term_invalid', __( "Parent term doesn't exist." ), array( 'status' => 400 ) );
+				return new WP_Error( 'rest_term_invalid', __( 'Parent term does not exist.' ), array( 'status' => 400 ) );
 			}
 		}
 
@@ -453,7 +453,7 @@
 		$term = get_term( (int) $request['id'], $this->taxonomy );
 
 		if ( ! $term ) {
-			return new WP_Error( 'rest_term_invalid', __( "Term doesn't exist." ), array( 'status' => 404 ) );
+			return new WP_Error( 'rest_term_invalid', __( 'Term does not exist.' ), array( 'status' => 404 ) );
 		}
 
 		if ( ! current_user_can( 'edit_term', $term->term_id ) ) {
@@ -481,7 +481,7 @@
 			$parent = get_term( (int) $request['parent'], $this->taxonomy );
 
 			if ( ! $parent ) {
-				return new WP_Error( 'rest_term_invalid', __( "Parent term doesn't exist." ), array( 'status' => 400 ) );
+				return new WP_Error( 'rest_term_invalid', __( 'Parent term does not exist.' ), array( 'status' => 400 ) );
 			}
 		}
 
@@ -542,7 +542,7 @@
 		$term = get_term( (int) $request['id'], $this->taxonomy );
 
 		if ( ! $term ) {
-			return new WP_Error( 'rest_term_invalid', __( "Term doesn't exist." ), array( 'status' => 404 ) );
+			return new WP_Error( 'rest_term_invalid', __( 'Term does not exist.' ), array( 'status' => 404 ) );
 		}
 
 		if ( ! current_user_can( 'delete_term', $term->term_id ) ) {