[gnome-maps] Mark a forgotten string for translation

[Piotr Drąg <piotrdrag src gnome org>]

commit 1de7d131ad12e682e379cbd30bb9434bd390a423
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Feb 6 21:47:57 2016 +0100

    Mark a forgotten string for translation

 data/ui/shape-layer-file-chooser.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/ui/shape-layer-file-chooser.ui b/data/ui/shape-layer-file-chooser.ui
index 4654ab1..906038b 100644
--- a/data/ui/shape-layer-file-chooser.ui
+++ b/data/ui/shape-layer-file-chooser.ui
@@ -9,7 +9,7 @@
         <property name="can-focus">True</property>
         <property name="can-default">True</property>
         <property name="use-underline">True</property>
-        <property name="label">_Open</property>
+        <property name="label" translatable="yes">_Open</property>
         <style>
           <class name="suggested-action"/>
         </style>