Fixes #4178

src/Console/Command/Task/ExtractTask.php

@@ -342,7 +342,7 @@ class ExtractTask extends Shell {
 	protected function _extractTokens() {
 		foreach ($this->_files as $file) {
 			$this->_file = $file;
-			$this->out('Processing %s...', $file);
+			$this->out(sprintf('Processing %s...', $file));
 
 			$code = file_get_contents($file);
 			$allTokens = token_get_all($code);