[seahorse] Mark missing strings for translation

[Piotr Drąg <piotrdrag src gnome org>]

commit 5bc04c53135b9b4f6a392b350cbae35e0b34fb84
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu Sep 28 14:23:43 2017 +0200

    Mark missing strings for translation

 pgp/seahorse-signer.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/pgp/seahorse-signer.ui b/pgp/seahorse-signer.ui
index 3a2e7fc..5b726a6 100644
--- a/pgp/seahorse-signer.ui
+++ b/pgp/seahorse-signer.ui
@@ -4,7 +4,7 @@
   <!-- interface-naming-policy toplevel-contextual -->
   <object class="GtkDialog" id="signer">
     <property name="border_width">5</property>
-    <property name="title">Choose Signing Key</property>
+    <property name="title" translatable="yes">Choose Signing Key</property>
     <property name="resizable">False</property>
     <property name="modal">True</property>
     <property name="default_width">400</property>