[gtranslator/wip/piotrdrag/fix-langcode-label] header-dialog: Add missing mnemonic to language code label

[Piotr Drąg <piotrdrag src gnome org>]

commit e92e931f1dc4daa53d5bb55ec35a16f89102580e
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Mon Oct 15 17:23:05 2018 +0200

    header-dialog: Add missing mnemonic to language code label
    
    Also use sentence capitalization to match the other labels in the dialog.

 src/gtr-header-dialog.ui | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/gtr-header-dialog.ui b/src/gtr-header-dialog.ui
index 43d2db04..2f4820c1 100644
--- a/src/gtr-header-dialog.ui
+++ b/src/gtr-header-dialog.ui
@@ -127,7 +127,8 @@
                           <object class="GtkLabel" id="language_code_label">
                             <property name="visible">True</property>
                             <property name="can_focus">False</property>
-                            <property name="label" translatable="yes">Language Code:</property>
+                            <property name="label" translatable="yes">Language _code:</property>
+                            <property name="use_underline">True</property>
                             <property name="xalign">0</property>
                           </object>
                           <packing>