[epiphany] Ensure new string is translatable

[Michael Catanzaro <mcatanzaro src gnome org>]

commit abc4f8e5308b0fc011bebd2cb148cccf07a829b2
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Wed May 30 21:37:12 2018 -0500

    Ensure new string is translatable

 src/resources/gtk/page-menu-popover.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/resources/gtk/page-menu-popover.ui b/src/resources/gtk/page-menu-popover.ui
index 8ecb58c47..c8feafd0e 100644
--- a/src/resources/gtk/page-menu-popover.ui
+++ b/src/resources/gtk/page-menu-popover.ui
@@ -35,7 +35,7 @@
             <child>
               <object class="GtkModelButton" id="zoom-level">
                 <property name="text">100%</property>
-                <property name="tooltip_text">Restore Zoom</property>
+                <property name="tooltip_text" translatable="yes">Restore Zoom</property>
                 <property name="action-name">win.zoom-normal</property>
                 <property name="iconic">True</property>
                 <property name="xalign">0.5</property>