Add language constant for grischa, and fix up indending *g*

lang/serendipity_lang_cs.inc.php

@@ -904,3 +904,4 @@ $i18n_filename_to = array (
 @define('PINGBACK_SENT', 'Pingback successful');
 @define('PINGBACK_FAILED', 'Pingback failed: %s');
 @define('PINGBACK_NOT_FOUND', 'No pingback-URI found.');
+@define('CATEGORY_PLUGIN_HIDEZEROCOUNT', 'Hide archives link when no entries were made in that timespan (requires counting entries)');