[network-manager-applet] editor: use Unicode quotation marks in a new string

[Piotr Drąg <piotrdrag src gnome org>]

commit e2becc81038ce9106a89c48c13fb55b707335134
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Wed Mar 28 19:20:50 2018 +0200

    editor: use Unicode quotation marks in a new string
    
    See https://developer.gnome.org/hig/stable/typography.html

 src/connection-editor/ce-page-general.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/connection-editor/ce-page-general.ui b/src/connection-editor/ce-page-general.ui
index 37fd8fc..bfbd26e 100644
--- a/src/connection-editor/ce-page-general.ui
+++ b/src/connection-editor/ce-page-general.ui
@@ -127,7 +127,7 @@
       <object class="GtkComboBox" id="metered_combo">
         <property name="visible">True</property>
         <property name="can_focus">False</property>
-        <property name="tooltip_text" translatable="yes">NetworkManager indicates to applications whether 
the connection is metered and therefore data usage should be restricted. Select which value ('Yes' or 'No') 
to indicate to applications, or 'Automatic' to use a default value based on the connection type and other 
heuristics.</property>
+        <property name="tooltip_text" translatable="yes">NetworkManager indicates to applications whether 
the connection is metered and therefore data usage should be restricted. Select which value (“Yes” or “No”) 
to indicate to applications, or “Automatic” to use a default value based on the connection type and other 
heuristics.</property>
         <property name="model">metered_store</property>
         <child>
           <object class="GtkCellRendererText" id="renderer2"/>