media empty selection: add string for errormessage

lang/serendipity_lang_hu.inc.php

@@ -618,6 +618,7 @@
 @define('FETCH_METHOD_HOTLINK', 'K<>zvetlen hivatkoz<6F>s szerverre');
 @define('GO_ADD_PROPERTIES', 'Mehet, majd ut<75>na a tulajdons<6E>gok szerkeszt<7A>se');
 @define('PLAIN_ASCII_NAMES', '(no special characters, umlauts)');
+@define('NO_FILE_SELECTED', 'For s9y to do something, you have to select a file first');
 
 /* ADMIN - MEDIA_PANE.TPL */
 @define('IMAGE_RESIZE', 'K<>p <20>tm<74>retez<65>se');