[latexila] BuildToolsPreferences: mark missing string for translation

[Sébastien Wilmet <swilmet src gnome org>]

commit 1fb7c8f7b17d09ca7e312a1542b79ca6063bc70a
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Apr 6 16:13:26 2015 +0200

    BuildToolsPreferences: mark missing string for translation

 src/build_tools_preferences.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/build_tools_preferences.vala b/src/build_tools_preferences.vala
index 4568b8f..16bb9ee 100644
--- a/src/build_tools_preferences.vala
+++ b/src/build_tools_preferences.vala
@@ -269,7 +269,7 @@ public class BuildToolsPreferences : GLib.Object
     {
         ToolButton copy_button = new ToolButton (null, null);
         copy_button.set_icon_name ("edit-copy-symbolic");
-        copy_button.set_tooltip_text ("Create a copy");
+        copy_button.set_tooltip_text (_("Create a copy"));
 
         set_sensitivity_on_selection (view, copy_button);