[hamster-applet] Add a translator comment about the 'None' string

[Claude Paroz <claudep src gnome org>]

commit 966bf9c04d428960c134ac93cb3a1bc9a8eb0d8a
Author: Claude Paroz <claude 2xlibre net>
Date:   Sat Jul 10 11:03:27 2010 +0200

    Add a translator comment about the 'None' string

 src/hamster/preferences.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/hamster/preferences.py b/src/hamster/preferences.py
index 447eb13..33e2977 100755
--- a/src/hamster/preferences.py
+++ b/src/hamster/preferences.py
@@ -108,6 +108,7 @@ class PreferencesEditor:
         self._gui = stuff.load_ui_file("preferences.ui")
         self.window = self.get_widget('preferences_window')
 
+        # Translators: 'None' refers here to the Todo list choice in Hamster preferences (Tracking tab)
         self.activities_sources = [("", _("None")),
                                    ("evo", "Evolution"),
                                    ("gtg", "Getting Things Gnome")]