misc cleanup:

* u2c: remove superfluous pathsep (harmless)
* tl: new strings

scripts/tl.py

@@ -114,6 +114,7 @@ var tl_cpanel = {{
 		"ab1": "disable no304",
 		"ac1": "enable no304",
 		"ad1": "enabling no304 will disable all caching; try this if k304 wasn't enough. This will waste a huge amount of network traffic!",
+		"ae1": "active downloads:",
 	}},
 }};