[gtranslator] Add missing mnemonic to assistant

[Daniel Mustieles García <dmustieles src gnome org>]

commit 90cb9011ad49100eebd33f4fc343cc5994ad77b9
Author: Daniel Mustieles <daniel mustieles gmail com>
Date:   Thu Mar 28 16:52:22 2019 +0100

    Add missing mnemonic to assistant

 src/gtr-languages-fetcher.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/gtr-languages-fetcher.ui b/src/gtr-languages-fetcher.ui
index cc042dbe..76124b30 100644
--- a/src/gtr-languages-fetcher.ui
+++ b/src/gtr-languages-fetcher.ui
@@ -197,7 +197,7 @@
             </child>
             <child>
               <object class="GtkCheckButton" id="advanced_check">
-                <property name="label" translatable="yes">Edit options manually</property>
+                <property name="label" translatable="yes">_Edit options manually</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">False</property>