new lang constant

lang/serendipity_lang_ta.inc.php

@@ -1097,3 +1097,4 @@
 @define('INSTALL_BACKENDPOPUP_GRANULAR_DESC', 'If you generally disable backend popups, you can specifically force using popups for specific places by entering a comma seperated list of places here. Available places are: ');
 @define('JS_FAILURE', 'The Serendipity JavaScript-library could not be loaded. This can happen due to PHP or Plugin errors, or even a malformed browser cache. To check the exact error please open <a href="%1$s">%1$s</a> manually in your browser and check for error messages.');
 @define('THEMES_PREVIEW_BLOG', 'See demo on blog.s9y.org');
+@define('SYNDICATION_PLUGIN_XML_DESC', 'Set to "none" if you only want to show a text link.');