Index: bin/importgettext.sh
===================================================================
--- bin/importgettext.sh	(revision 7fe3811c65a7c63154f03610e289a6d196f3ae2e)
+++ bin/importgettext.sh	(revision ae4bad986b505ccbb6c95e2415035ea5aef81b48)
@@ -100,4 +100,8 @@
 	$translator = '';
 
+	// get language code from file name
+	if (preg_match('/-([a-z_]+).po$/i', $fn, $m))
+	  $language = expand_langcode($m[1]);
+
 	$is_header = true;
 	$msgid = null;