[epiphany] Mark forgotten string for translation

[Piotr Drąg <piotrdrag src gnome org>]

commit aa4fb042155170bc306403a616f9cbfdae89ff63
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu Mar 23 17:52:59 2017 +0100

    Mark forgotten string for translation

 src/resources/gtk/bookmark-properties-grid.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/resources/gtk/bookmark-properties-grid.ui b/src/resources/gtk/bookmark-properties-grid.ui
index 0ec0223..c200cf7 100644
--- a/src/resources/gtk/bookmark-properties-grid.ui
+++ b/src/resources/gtk/bookmark-properties-grid.ui
@@ -137,7 +137,7 @@
         </style>
         <child>
           <object class="GtkEntry" id="add_tag_entry">
-            <property name="placeholder-text">Add Tag…</property>
+            <property name="placeholder-text" translatable="yes">Add Tag…</property>
             <property name="activates-default">true</property>
             <property name="hexpand">true</property>
             <property name="visible">true</property>