Correct spelling.

src/Shell/I18nShell.php

@@ -76,7 +76,7 @@ class I18nShell extends Shell
     public function init($language = null)
     {
         if (!$language) {
-            $language = strtolower($this->in('What language? Please use the two-letter ISO code, e.g. `en`.'));
+            $language = strtolower($this->in('Please specify language code, e.g. `en`, `eng`, `en_US` etc.'));
         }
         if (strlen($language) < 2) {
             return $this->error('Invalid language code. Valid is `en`, `eng`, `en_US` etc.');