CC-1960: Internationalize Airtime / Support translations

-enabled i18n for datatables, colVis, columnFilter, and fullCalendar
-fixed typos in full-calendar-functions.js

airtime_mvc/public/js/datatables/plugin/AIRTIME_DEV_README_COL_VIS

@@ -30,4 +30,8 @@ The new _fnDomBaseButton looks like this:
         
         return nButton;
     },
-    
+    
+--------------------------------------------------------------------------------
+* Line 96 has changed
+- "buttonText": "Show / hide columns",
++ "buttonText": $.i18n._("Show / hide columns"),

airtime_mvc/public/js/datatables/plugin/dataTables.ColVis.js

@@ -95,7 +95,7 @@ ColVis = function( oDTSettings, oInit )
          *  @type     String
          *  @default  Show / hide columns
          */
-        "buttonText": "Show / hide columns",
+        "buttonText": $.i18n._("Show / hide columns"),
         
         /**
          * Flag to say if the collection is hidden

airtime_mvc/public/js/datatables/plugin/dataTables.columnFilter.js

@@ -585,7 +585,7 @@
             sRangeSeparator: "~",
             iFilteringDelay: 500,
             aoColumns: null,
-            sRangeFormat: "From {from} to {to}"
+            sRangeFormat: $.i18n._("From {from} to {to}")
         };
 
         properties = $.extend(defaults, options);