[gnome-calculator] Add a translator comment to Keywords in the .desktop file

[Piotr Drąg <piotrdrag src gnome org>]

commit f0bb74b1138fa5ede75f144aeef04890eb979ab5
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu May 25 16:04:30 2017 +0200

    Add a translator comment to Keywords in the .desktop file
    
    Hopefully, we’ll get fewer broken translations.

 data/org.gnome.Calculator.desktop.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/org.gnome.Calculator.desktop.in b/data/org.gnome.Calculator.desktop.in
index 75b65fc..b9495ef 100644
--- a/data/org.gnome.Calculator.desktop.in
+++ b/data/org.gnome.Calculator.desktop.in
@@ -1,6 +1,7 @@
 [Desktop Entry]
 Name=Calculator
 Comment=Perform arithmetic, scientific or financial calculations
+# Translators: Search terms to find this application. Do NOT translate or localize the semicolons! The list 
MUST also end with a semicolon!
 Keywords=calculation;arithmetic;scientific;financial;
 Exec=gnome-calculator
 # Translators: Do NOT translate or transliterate this text (this is an icon file name)!