[gnome-calculator] Fixed translator comment

[Robert Roth <robertroth src gnome org>]

commit 41f0bb1e93e2f1c0788c4e9f193c35733a6c75d1
Author: Robert Roth <robert roth bee-tf ro>
Date:   Sun Feb 3 19:21:58 2019 +0200

    Fixed translator comment

 src/math-preferences.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/math-preferences.vala b/src/math-preferences.vala
index 335b97c6..27a735fc 100644
--- a/src/math-preferences.vala
+++ b/src/math-preferences.vala
@@ -183,7 +183,7 @@ public class MathPreferencesDialog : Gtk.Dialog
         word_size_combo.pack_start (renderer, true);
         word_size_combo.add_attribute (renderer, "text", 0);
 
-        label = new Gtk.Label.with_mnemonic (/* Preferences dialog: Label for word size combo box */
+        label = new Gtk.Label.with_mnemonic (/* Preferences dialog: Label for exchange rate refresh interval 
combo box */
                                              _("Exchange rate refresh interval"));
         label.show ();
         label.xalign = 0;