diff --git a/wp-admin/plugins.php b/wp-admin/plugins.php
index 4d8c797b04..c80e96831f 100644
--- a/wp-admin/plugins.php
+++ b/wp-admin/plugins.php
@@ -479,7 +479,15 @@ if ( isset( $_GET['error'] ) ) :
 	if ( isset( $_GET['main'] ) ) {
 		$errmsg = __( 'You cannot delete a plugin while it is active on the main site.' );
 	} elseif ( isset( $_GET['charsout'] ) ) {
-		$errmsg = sprintf( __( 'The plugin generated %d characters of <strong>unexpected output</strong> during activation. If you notice &#8220;headers already sent&#8221; messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.' ), $_GET['charsout'] );
+		$errmsg  = sprintf(
+			_n(
+				'The plugin generated %d character of <strong>unexpected output</strong> during activation.',
+				'The plugin generated %d characters of <strong>unexpected output</strong> during activation.',
+				$_GET['charsout']
+			),
+			$_GET['charsout']
+		);
+		$errmsg .= ' ' . __( 'If you notice &#8220;headers already sent&#8221; messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.' );
 	} else {
 		$errmsg = __( 'Plugin could not be activated because it triggered a <strong>fatal error</strong>.' );
 	}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3a9aa7df00..dc7f2fad74 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-43666';
+$wp_version = '5.0-alpha-43667';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.