[gnome-tweak-tool] Add translator comment (Bug #750297)

[Christian Kirbach <ckirbach src gnome org>]

commit 786067ce3113b1cc63f7c8938dec9c5e54bc4ab2
Author: Christian Kirbach <christian kirbach gmail com>
Date:   Sun Jun 14 11:28:52 2015 +0200

    Add translator comment (Bug #750297)

 gtweak/tweaks/tweak_group_keymouse.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtweak/tweaks/tweak_group_keymouse.py b/gtweak/tweaks/tweak_group_keymouse.py
index 1f5c9a4..e4cce7b 100644
--- a/gtweak/tweaks/tweak_group_keymouse.py
+++ b/gtweak/tweaks/tweak_group_keymouse.py
@@ -37,6 +37,7 @@ class PrimaryPasteTweak(GetterSetterSwitchTweak):
 class KeyThemeSwitcher(GSettingsComboTweak):
     def __init__(self, **options):
         GSettingsComboTweak.__init__(self,
+                       # Translators: This setting refers to a set of pre-defined key bindings
                        _("Key theme"),
             "org.gnome.desktop.interface",
             "gtk-key-theme",