[gbrainy] Add comment for translators

[Jordi Mas <jmas src gnome org>]

commit 406a7cd227c4f8930fe9d9110c00a355150c0303
Author: Jordi Mas <jmas softcatala org>
Date:   Fri Jan 4 13:49:33 2013 +0100

    Add comment for translators

 data/verbal_analogies.xml |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/verbal_analogies.xml b/data/verbal_analogies.xml
index 3f2cadb..6f8ee20 100644
--- a/data/verbal_analogies.xml
+++ b/data/verbal_analogies.xml
@@ -406,6 +406,7 @@
 		<_answer>Accordion</_answer>
 		<!-- Translator: As a noun -->
 		<_answer correct = "yes">Violin</_answer>
+		<!-- Translator: 'keys' as the ones found in a keyboard -->
 		<_rationale>It is the only instrument that does not have keys.</_rationale>
 	</analogy>