diff --git a/koha-tmpl/opac-tmpl/prog/en/includes/calendar.inc b/koha-tmpl/opac-tmpl/prog/en/includes/calendar.inc
index 140abeb08c..43ba02268f 100644
--- a/koha-tmpl/opac-tmpl/prog/en/includes/calendar.inc
+++ b/koha-tmpl/opac-tmpl/prog/en/includes/calendar.inc
@@ -1,6 +1,66 @@
 <link rel="stylesheet" type="text/css" href="[% themelang %]/lib/calendar/calendar-system.css"/>
 <script type="text/javascript" src="[% themelang %]/lib/calendar/calendar.js"></script>
-<script type="text/javascript" src="[% themelang %]/lib/calendar/calendar-en.js"></script>
+<script type="text/javascript">
+// full day names
+Calendar._DN = new Array(_("Sunday"),_("Monday"),_("Tuesday"),_("Wednesday"),_("Thursday"),_("Friday"),_("Saturday"),_("Sunday"));
+// short day names
+Calendar._SDN = new Array(_("Sun"),_("Mon"),_("Tue"),_("Wed"),_("Thu"),_("Fri"),_("Sat"),_("Sun"));
+// First day of the week. "0" means display Sunday first, "1" means display
+// Monday first, etc.
+Calendar._FD = 1;
+// full month names
+Calendar._MN = new Array(_("January"),_("February"),_("March"),_("April"),_("May"),_("June"),_("July"),_("August"),_("September"),_("October"),_("November"),_("December"));
+// short month names
+Calendar._SMN = new Array(_("Jan"),_("Feb"),_("Mar"),_("Apr"),_("May"),_("Jun"),_("Jul"),_("Aug"),_("Sep"),_("Oct"),_("Nov"),_("Dec"));
+// tooltips
+Calendar._TT = {};
+Calendar._TT["INFO"] = _("About the calendar");
+
+Calendar._TT["ABOUT"] =
+_("Dhtml Date/Time Selector")+"\n" +
+"(c) dynarch.com 2002-2003\n" + // don't translate this this ;-)
+_("For latest version visit: http://dynarch.com/mishoo/calendar.epl")+"\n" +
+_("Distributed under GNU LGPL.  See http://gnu.org/licenses/lgpl.html for details.") +
+"\n\n" +
+_("Date selection:")+"\n" +
+_("- Use the \xab, \xbb buttons to select year")+"\n" +
+_("- Use the " + String.fromCharCode(0x2039) + ", " + String.fromCharCode(0x203a) + " buttons to select month")+"\n" +
+_("- Hold mouse button on any of the above buttons for faster selection.");
+Calendar._TT["ABOUT_TIME"] = "\n\n" +
+_("Time selection:")+"\n" +
+_("- Click on any of the time parts to increase it")+"\n" +
+_("- or Shift-click to decrease it")+"\n" +
+_("- or click and drag for faster selection.");
+
+Calendar._TT["PREV_YEAR"] = _("Prev. year (hold for menu)");
+Calendar._TT["PREV_MONTH"] = _("Prev. month (hold for menu)");
+Calendar._TT["GO_TODAY"] = _("Go to Today");
+Calendar._TT["NEXT_MONTH"] = _("Next month (hold for menu)");
+Calendar._TT["NEXT_YEAR"] = _("Next year (hold for menu)");
+Calendar._TT["SEL_DATE"] = _("Select date");
+Calendar._TT["DRAG_TO_MOVE"] = _("Drag to move");
+Calendar._TT["PART_TODAY"] = _(" (today)");
+
+// the following is to inform that "%s" is to be the first day of week
+// %s will be replaced with the day name.
+Calendar._TT["DAY_FIRST"] = _("Display %s first");
+
+// This may be locale-dependent.  It specifies the week-end days, as an array
+// of comma-separated numbers.  The numbers are from 0 to 6: 0 means Sunday, 1
+// means Monday, etc.
+Calendar._TT["WEEKEND"] = "0,6";
+
+Calendar._TT["CLOSE"] = _("Close");
+Calendar._TT["TODAY"] = _("Today");
+Calendar._TT["TIME_PART"] = _("(Shift-)Click or drag to change value");
+
+// date formats
+Calendar._TT["DEF_DATE_FORMAT"] = "%Y-%m-%d";
+Calendar._TT["TT_DATE_FORMAT"] = "%a, %b %e";
+
+Calendar._TT["WK"] = _("wk");
+Calendar._TT["TIME"] = _("Time:");
+</script>
 <script type="text/javascript" src="[% themelang %]/lib/calendar/calendar-setup.js"></script>
 <script type="text/javascript">
 //<![CDATA[