[update] calendar xml template to add calendar_description field if defined

static/src/xml/calendar_view.xml

+<template>
+
+    <t t-inherit="web.calendar-box" t-name="cgscop_fullcalendar.cgscop-calendar-box" t-inherit-mode="extension">
+        <xpath expr="//div[hasclass('o_event_title')]" position="replace">
+            <t t-if="record.calendar_description">
+                <div class="o_event_title">
+                    <t t-raw="record.calendar_description" />
+                </div>
+            </t>
+            <t t-else="">
+                <div class="o_event_title" t-esc="record.display_name"/>
+            </t>
+        </xpath>
+    </t>
+
+</template>