a couple extra useful "posted in" strings

public/language/en_GB/global.json

@@ -72,9 +72,11 @@
 	"posted_ago_by": "posted %1 by %2",
 	"posted_ago": "posted %1",
 
-	"posted_in_ago_by_guest": "posted in %1 %2 by Guest",
+	"posted_in": "posted in %1",
-	"posted_in_ago_by": "posted in %1 %2 by %3",
+	"posted_in_by": "posted in %1 by %2",
 	"posted_in_ago": "posted in %1 %2",
+	"posted_in_ago_by": "posted in %1 %2 by %3",
+	"posted_in_ago_by_guest": "posted in %1 %2 by Guest",
 
 	"replied_ago": "replied %1",
 	"user_posted_ago": "%1 posted %2",