[gnome-builder] Add a translator comment to keywords string

[Piotr Drąg <piotrdrag src gnome org>]

commit 7b4219d3e6305a7bba1e31383adf20d82474a8f4
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Tue Mar 15 00:00:56 2016 +0100

    Add a translator comment to keywords string
    
    Every other keywords string has a comment or (if comment's not possible) context.

 plugins/vala-pack/ide-vala-preferences-addin.vala |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/plugins/vala-pack/ide-vala-preferences-addin.vala 
b/plugins/vala-pack/ide-vala-preferences-addin.vala
index 9919261..2f824c0 100644
--- a/plugins/vala-pack/ide-vala-preferences-addin.vala
+++ b/plugins/vala-pack/ide-vala-preferences-addin.vala
@@ -32,6 +32,7 @@ namespace Ide {
                                                                      null,
                                                                      _("Vala"),
                                                                      _("Show errors and warnings provided by 
Vala"),
+                                                                     /* translators: keywords used when 
searching for preferences */
                                                                      _("vala diagnostics warnings errors"),
                                                                      100);
                }