[dconf-editor] Add a comment for translators.

[Arnaud B. <arnaudb src gnome org>]

commit 7ad8d4a2f6711439e3eeab6b5fa53d8ffdfbd007
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sat Jun 16 18:52:40 2018 +0200

    Add a comment for translators.

 editor/ca.desrt.dconf-editor.gschema.xml | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/editor/ca.desrt.dconf-editor.gschema.xml b/editor/ca.desrt.dconf-editor.gschema.xml
index 890aaf8..a8faa01 100644
--- a/editor/ca.desrt.dconf-editor.gschema.xml
+++ b/editor/ca.desrt.dconf-editor.gschema.xml
@@ -315,6 +315,7 @@
     </key>
     <key name="pair-of-integers" type="(ii)">
       <default>(800, 600)</default>
+      <!-- Translators: do not forget the parenthesis, they are meaningful. -->
       <summary>A custom type, here ‘(ii)’</summary>
       <description>Dconf Editor lets you edit any settings type supported by GSettings, falling back on a 
string entry when it doesn’t have a better way to do. Here is a tuple of two 32-bit signed 
integers.</description>
     </key>