CC-1960: Internationalize Airtime / Support translations

-added gettext wrapper function to all strings missing it
-i18n of jquery timepicker and datepicker
-i18n of jquery datatables columnFilter input place holder labels

airtime_mvc/application/models/Webstream.php

@@ -50,7 +50,7 @@ class Application_Model_Webstream implements Application_Model_LibraryEditable
             list($hours, $min, $sec) = $arr;
             $di = new DateInterval("PT{$hours}H{$min}M{$sec}S");
 
-            return $di->format("%Hh %Im");
+            return $di->format("%H"._("h")."  %I"._("m"));
         } 
 
         return "";