[california] Use double quotes in app-menu.interface

[Piotr Drąg <piotrdrag src gnome org>]

commit 88cb8d60eaf89fb67cbc594c31c9dbeeb8b8a2aa
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Tue Mar 11 02:17:11 2014 +0100

    Use double quotes in app-menu.interface
    
    So it's friendlier to intltool.

 src/rc/app-menu.interface |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/src/rc/app-menu.interface b/src/rc/app-menu.interface
index 8ddc755..19cc62f 100644
--- a/src/rc/app-menu.interface
+++ b/src/rc/app-menu.interface
@@ -1,16 +1,16 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
-    <menu id='app-menu'>
+    <menu id="app-menu">
         <section>
             <item>
-                <attribute name='label' translatable='yes'>_About</attribute>
-                <attribute name='action'>app.about</attribute>
+                <attribute name="label" translatable="yes">_About</attribute>
+                <attribute name="action">app.about</attribute>
             </item>
         </section>
         <section>
             <item>
-                <attribute name='label' translatable='yes'>_Quit</attribute>
-                <attribute name='action'>app.quit</attribute>
+                <attribute name="label" translatable="yes">_Quit</attribute>
+                <attribute name="action">app.quit</attribute>
                 <attribute name="accel">&lt;Primary&gt;q</attribute>
             </item>
         </section>