[gnome-calculator] Added translator comment for mode arguments

[Robert Roth <robertroth src gnome org>]

commit 90fff26791a07e5e1ce028fe4cc203b5377bb346
Author: Robert Roth <robert roth off gmail com>
Date:   Sat Feb 1 21:58:21 2020 +0200

    Added translator comment for mode arguments

 src/gnome-calculator.vala | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/gnome-calculator.vala b/src/gnome-calculator.vala
index d4816606..0f3141be 100644
--- a/src/gnome-calculator.vala
+++ b/src/gnome-calculator.vala
@@ -21,6 +21,7 @@ public class Calculator : Gtk.Application
     private static string mode_string = null;
 
     private const OptionEntry[] option_entries = {
+        /* Translators: Do not translate possible mode names basic, advanced, financial, programming and 
keyboard */
         { "mode", 'm', 0, OptionArg.STRING, ref mode_string, N_("Start in given mode (basic, advanced, 
financial, programming, keyboard)"), "mode" },
         { "solve", 's', 0, OptionArg.STRING, null, N_("Solve given equation"), "equation" },
         { "equation", 'e', 0, OptionArg.STRING, ref equation_string, N_("Start with given equation"), 
"equation"},