[gnome-screenshot] Use Unicode in translatable strings

[Piotr Drąg <piotrdrag src gnome org>]

commit c3143a36d8a22d5667a86137772446f72a5dbfd4
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu Nov 10 14:08:42 2016 +0100

    Use Unicode in translatable strings
    
    See https://developer.gnome.org/hig/stable/typography.html
    
    https://bugzilla.gnome.org/show_bug.cgi?id=774204

 src/org.gnome.Screenshot.appdata.xml.in    |    2 +-
 src/org.gnome.gnome-screenshot.gschema.xml |    2 +-
 src/screenshot-application.c               |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/org.gnome.Screenshot.appdata.xml.in b/src/org.gnome.Screenshot.appdata.xml.in
index a357e22..52fdcd8 100644
--- a/src/org.gnome.Screenshot.appdata.xml.in
+++ b/src/org.gnome.Screenshot.appdata.xml.in
@@ -14,7 +14,7 @@
       paste it into other applications.
     </_p>
     <_p>
-      GNOME Screenshot allows you to take screenshots even when it's not open: just
+      GNOME Screenshot allows you to take screenshots even when it’s not open: just
       press the PrtSc button on your keyboard, and a snapshot of your whole screen will
       be saved to your Pictures folder.
       Hold Alt while pressing PrtSc and you will get a screenshot of only the currently
diff --git a/src/org.gnome.gnome-screenshot.gschema.xml b/src/org.gnome.gnome-screenshot.gschema.xml
index 17cdf0b..b998853 100644
--- a/src/org.gnome.gnome-screenshot.gschema.xml
+++ b/src/org.gnome.gnome-screenshot.gschema.xml
@@ -44,7 +44,7 @@
     <key name="border-effect" type="s">
       <default>'none'</default>
       <summary>Border Effect</summary>
-      <description>Effect to add to the outside of a border.  Possible values are "shadow", "none", and 
"border".</description>
+      <description>Effect to add to the outside of a border.  Possible values are “shadow”, “none”, and 
“border”.</description>
     </key>
     <key name="default-file-type" enum="org.gnome.gnome-screenshot.file-types">
       <default>'png'</default>
diff --git a/src/screenshot-application.c b/src/screenshot-application.c
index 791bb9c..65e0eb5 100644
--- a/src/screenshot-application.c
+++ b/src/screenshot-application.c
@@ -142,7 +142,7 @@ save_pixbuf_handle_error (ScreenshotApplication *self,
           gchar *folder_uri = g_path_get_basename (folder);
           gchar *folder_name = g_uri_unescape_string (folder_uri, NULL);
           gchar *file_name = screenshot_dialog_get_filename (dialog);
-          gchar *detail = g_strdup_printf (_("A file named \"%s\" already exists in \"%s\""),
+          gchar *detail = g_strdup_printf (_("A file named “%s” already exists in “%s”"),
                                            file_name, folder_name);
           gint response;