[gnome-calendar] Add translator comments to the .desktop file

[Piotr Drąg <piotrdrag src gnome org>]

commit 1457accb3a439a056abbb34a797d37f12b7e2f1c
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Apr 29 16:08:10 2017 +0200

    Add translator comments to the .desktop file
    
    So hopefully we get fewer invalid translations that possibly break build.

 data/org.gnome.Calendar.desktop.in |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/data/org.gnome.Calendar.desktop.in b/data/org.gnome.Calendar.desktop.in
index 0421c4a..71b7f1b 100644
--- a/data/org.gnome.Calendar.desktop.in
+++ b/data/org.gnome.Calendar.desktop.in
@@ -2,11 +2,13 @@
 Name=Calendar
 Comment=Access and manage your calendars
 Exec=gnome-calendar
+# Translators: Do NOT translate or transliterate this text (this is an icon file name)!
 Icon=org.gnome.Calendar
 Terminal=false
 Type=Application
 StartupNotify=true
 Categories=GNOME;GTK;Office;Calendar;Core;
+# Translators: Search terms to find this application. Do NOT translate or localize the semicolons! The list 
MUST also end with a semicolon!
 Keywords=Calendar;Event;Reminder;
 MimeType=text/calendar;
 DBusActivatable=true