exclude BaseYii from message command

framework/messages/config.php

@@ -38,6 +38,7 @@ return [
         '.hgignore',
         '.hgkeep',
         '/messages',
+        '/BaseYii.php', // contains examples about Yii:t()
     ],
     // array, list of patterns that specify which files (not directories) should be processed.
     // If empty or not set, all files will be processed.