diff --git a/wp-admin/edit-tags.php b/wp-admin/edit-tags.php
index 43033ac981..dbb1f48363 100644
--- a/wp-admin/edit-tags.php
+++ b/wp-admin/edit-tags.php
@@ -10,12 +10,12 @@
 require_once( dirname( __FILE__ ) . '/admin.php' );
 
 if ( ! $taxnow )
-	wp_die( __( 'Invalid taxonomy' ) );
+	wp_die( __( 'Invalid taxonomy.' ) );
 
 $tax = get_taxonomy( $taxnow );
 
 if ( ! $tax )
-	wp_die( __( 'Invalid taxonomy' ) );
+	wp_die( __( 'Invalid taxonomy.' ) );
 
 if ( ! in_array( $tax->name, get_taxonomies( array( 'show_ui' => true ) ) ) ) {
    wp_die( __( 'Sorry, you are not allowed to manage these items.' ) );
diff --git a/wp-admin/includes/class-wp-terms-list-table.php b/wp-admin/includes/class-wp-terms-list-table.php
index dcef0d71d8..e765794a4e 100644
--- a/wp-admin/includes/class-wp-terms-list-table.php
+++ b/wp-admin/includes/class-wp-terms-list-table.php
@@ -53,7 +53,7 @@ class WP_Terms_List_Table extends WP_List_Table {
 			$taxonomy = 'post_tag';
 
 		if ( ! taxonomy_exists( $taxonomy ) )
-			wp_die( __( 'Invalid taxonomy' ) );
+			wp_die( __( 'Invalid taxonomy.' ) );
 
 		$tax = get_taxonomy( $taxonomy );
 
diff --git a/wp-includes/class-wp-term.php b/wp-includes/class-wp-term.php
index d53d518494..3b4931a041 100644
--- a/wp-includes/class-wp-term.php
+++ b/wp-includes/class-wp-term.php
@@ -176,7 +176,7 @@ final class WP_Term {
 
 			// Don't return terms from invalid taxonomies.
 			if ( ! taxonomy_exists( $_term->taxonomy ) ) {
-				return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy' ) );
+				return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
 			}
 
 			$_term = sanitize_term( $_term, $_term->taxonomy, 'raw' );
diff --git a/wp-includes/class-wp-xmlrpc-server.php b/wp-includes/class-wp-xmlrpc-server.php
index 71b1e1c603..be2d3edb7d 100644
--- a/wp-includes/class-wp-xmlrpc-server.php
+++ b/wp-includes/class-wp-xmlrpc-server.php
@@ -1426,7 +1426,7 @@ class wp_xmlrpc_server extends IXR_Server {
 						$term = get_term_by( 'id', $term_id, $taxonomy );
 
 						if ( ! $term )
-							return new IXR_Error( 403, __( 'Invalid term ID' ) );
+							return new IXR_Error( 403, __( 'Invalid term ID.' ) );
 
 						$terms[$taxonomy][] = (int) $term_id;
 					}
@@ -1873,7 +1873,7 @@ class wp_xmlrpc_server extends IXR_Server {
 		do_action( 'xmlrpc_call', 'wp.newTerm' );
 
 		if ( ! taxonomy_exists( $content_struct['taxonomy'] ) )
-			return new IXR_Error( 403, __( 'Invalid taxonomy' ) );
+			return new IXR_Error( 403, __( 'Invalid taxonomy.' ) );
 
 		$taxonomy = get_taxonomy( $content_struct['taxonomy'] );
 
@@ -1960,7 +1960,7 @@ class wp_xmlrpc_server extends IXR_Server {
 		do_action( 'xmlrpc_call', 'wp.editTerm' );
 
 		if ( ! taxonomy_exists( $content_struct['taxonomy'] ) )
-			return new IXR_Error( 403, __( 'Invalid taxonomy' ) );
+			return new IXR_Error( 403, __( 'Invalid taxonomy.' ) );
 
 		$taxonomy = get_taxonomy( $content_struct['taxonomy'] );
 
@@ -1978,7 +1978,7 @@ class wp_xmlrpc_server extends IXR_Server {
 			return new IXR_Error( 500, $term->get_error_message() );
 
 		if ( ! $term )
-			return new IXR_Error( 404, __( 'Invalid term ID' ) );
+			return new IXR_Error( 404, __( 'Invalid term ID.' ) );
 
 		if ( isset( $content_struct['name'] ) ) {
 			$term_data['name'] = trim( $content_struct['name'] );
@@ -2056,7 +2056,7 @@ class wp_xmlrpc_server extends IXR_Server {
 		do_action( 'xmlrpc_call', 'wp.deleteTerm' );
 
 		if ( ! taxonomy_exists( $taxonomy ) )
-			return new IXR_Error( 403, __( 'Invalid taxonomy' ) );
+			return new IXR_Error( 403, __( 'Invalid taxonomy.' ) );
 
 		$taxonomy = get_taxonomy( $taxonomy );
 
@@ -2069,7 +2069,7 @@ class wp_xmlrpc_server extends IXR_Server {
 			return new IXR_Error( 500, $term->get_error_message() );
 
 		if ( ! $term )
-			return new IXR_Error( 404, __( 'Invalid term ID' ) );
+			return new IXR_Error( 404, __( 'Invalid term ID.' ) );
 
 		$result = wp_delete_term( $term_id, $taxonomy->name );
 
@@ -2127,7 +2127,7 @@ class wp_xmlrpc_server extends IXR_Server {
 		do_action( 'xmlrpc_call', 'wp.getTerm' );
 
 		if ( ! taxonomy_exists( $taxonomy ) )
-			return new IXR_Error( 403, __( 'Invalid taxonomy' ) );
+			return new IXR_Error( 403, __( 'Invalid taxonomy.' ) );
 
 		$taxonomy = get_taxonomy( $taxonomy );
 
@@ -2140,7 +2140,7 @@ class wp_xmlrpc_server extends IXR_Server {
 			return new IXR_Error( 500, $term->get_error_message() );
 
 		if ( ! $term )
-			return new IXR_Error( 404, __( 'Invalid term ID' ) );
+			return new IXR_Error( 404, __( 'Invalid term ID.' ) );
 
 		return $this->_prepare_term( $term );
 	}
@@ -2185,7 +2185,7 @@ class wp_xmlrpc_server extends IXR_Server {
 		do_action( 'xmlrpc_call', 'wp.getTerms' );
 
 		if ( ! taxonomy_exists( $taxonomy ) )
-			return new IXR_Error( 403, __( 'Invalid taxonomy' ) );
+			return new IXR_Error( 403, __( 'Invalid taxonomy.' ) );
 
 		$taxonomy = get_taxonomy( $taxonomy );
 
@@ -2280,7 +2280,7 @@ class wp_xmlrpc_server extends IXR_Server {
 		do_action( 'xmlrpc_call', 'wp.getTaxonomy' );
 
 		if ( ! taxonomy_exists( $taxonomy ) )
-			return new IXR_Error( 403, __( 'Invalid taxonomy' ) );
+			return new IXR_Error( 403, __( 'Invalid taxonomy.' ) );
 
 		$taxonomy = get_taxonomy( $taxonomy );
 
diff --git a/wp-includes/taxonomy.php b/wp-includes/taxonomy.php
index d5d8a344b5..0aa97eca74 100644
--- a/wp-includes/taxonomy.php
+++ b/wp-includes/taxonomy.php
@@ -505,7 +505,7 @@ function register_taxonomy( $taxonomy, $object_type, $args = array() ) {
  */
 function unregister_taxonomy( $taxonomy ) {
 	if ( ! taxonomy_exists( $taxonomy ) ) {
-		return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy' ) );
+		return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
 	}
 
 	$taxonomy_args = get_taxonomy( $taxonomy );
@@ -736,7 +736,7 @@ function get_objects_in_term( $term_ids, $taxonomies, $args = array() ) {
 	}
 	foreach ( (array) $taxonomies as $taxonomy ) {
 		if ( ! taxonomy_exists( $taxonomy ) ) {
-			return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy' ) );
+			return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
 		}
 	}
 
@@ -826,7 +826,7 @@ function get_term( $term, $taxonomy = '', $output = OBJECT, $filter = 'raw' ) {
 	}
 
 	if ( $taxonomy && ! taxonomy_exists( $taxonomy ) ) {
-		return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy' ) );
+		return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
 	}
 
 	if ( $term instanceof WP_Term ) {
@@ -988,8 +988,9 @@ function get_term_by( $field, $value, $taxonomy = '', $output = OBJECT, $filter
  * @return array|WP_Error List of Term IDs. WP_Error returned if `$taxonomy` does not exist.
  */
 function get_term_children( $term_id, $taxonomy ) {
-	if ( ! taxonomy_exists($taxonomy) )
-		return new WP_Error('invalid_taxonomy', __('Invalid taxonomy'));
+	if ( ! taxonomy_exists( $taxonomy ) ) {
+		return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
+	}
 
 	$term_id = intval( $term_id );
 
@@ -1208,7 +1209,7 @@ function get_terms( $args = array(), $deprecated = '' ) {
 	if ( ! empty( $args['taxonomy'] ) ) {
 		foreach ( $args['taxonomy'] as $taxonomy ) {
 			if ( ! taxonomy_exists( $taxonomy ) ) {
-				return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy' ) );
+				return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
 			}
 		}
 	}
@@ -1975,7 +1976,7 @@ function wp_get_object_terms($object_ids, $taxonomies, $args = array()) {
 
 	foreach ( $taxonomies as $taxonomy ) {
 		if ( ! taxonomy_exists($taxonomy) )
-			return new WP_Error('invalid_taxonomy', __('Invalid taxonomy'));
+			return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
 	}
 
 	if ( !is_array($object_ids) )
@@ -2226,7 +2227,7 @@ function wp_insert_term( $term, $taxonomy, $args = array() ) {
 	global $wpdb;
 
 	if ( ! taxonomy_exists($taxonomy) ) {
-		return new WP_Error('invalid_taxonomy', __('Invalid taxonomy'));
+		return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
 	}
 	/**
 	 * Filters a term before it is sanitized and inserted into the database.
@@ -2241,10 +2242,10 @@ function wp_insert_term( $term, $taxonomy, $args = array() ) {
 		return $term;
 	}
 	if ( is_int($term) && 0 == $term ) {
-		return new WP_Error('invalid_term_id', __('Invalid term ID'));
+		return new WP_Error( 'invalid_term_id', __( 'Invalid term ID.' ) );
 	}
 	if ( '' == trim($term) ) {
-		return new WP_Error('empty_term_name', __('A name is required for this term'));
+		return new WP_Error( 'empty_term_name', __( 'A name is required for this term.' ) );
 	}
 	$defaults = array( 'alias_of' => '', 'description' => '', 'parent' => 0, 'slug' => '');
 	$args = wp_parse_args( $args, $defaults );
@@ -2473,8 +2474,9 @@ function wp_set_object_terms( $object_id, $terms, $taxonomy, $append = false ) {
 
 	$object_id = (int) $object_id;
 
-	if ( ! taxonomy_exists($taxonomy) )
-		return new WP_Error('invalid_taxonomy', __('Invalid taxonomy'));
+	if ( ! taxonomy_exists( $taxonomy ) ) {
+		return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
+	}
 
 	if ( !is_array($terms) )
 		$terms = array($terms);
@@ -2611,7 +2613,7 @@ function wp_remove_object_terms( $object_id, $terms, $taxonomy ) {
 	$object_id = (int) $object_id;
 
 	if ( ! taxonomy_exists( $taxonomy ) ) {
-		return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy' ) );
+		return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
 	}
 
 	if ( ! is_array( $terms ) ) {
@@ -2807,7 +2809,7 @@ function wp_update_term( $term_id, $taxonomy, $args = array() ) {
 	global $wpdb;
 
 	if ( ! taxonomy_exists( $taxonomy ) ) {
-		return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy' ) );
+		return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
 	}
 
 	$term_id = (int) $term_id;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index ab2a333bfb..1cc0ea4bc4 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-beta3-38076';
+$wp_version = '4.6-beta3-38077';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.