[i18n] German: flip alter/neuer typo (#3668)

Fixes https://github.com/FreshRSS/FreshRSS/issues/3667

app/i18n/de/sub.php

@@ -124,8 +124,8 @@ return array(
 	),
 	'tag' => array(
 		'name' => 'Name',
-		'new_name' => 'Alter Name',
-		'old_name' => 'Neuer Name',
+		'new_name' => 'Neuer Name',
+		'old_name' => 'Alter Name',
 	),
 	'title' => array(
 		'_' => 'Abonnementverwaltung',