[gedit-plugins] Documentation for Yandex API key

[Jordi Mas <jmas src gnome org>]

commit 7be6924e784fb9b21106de3dce019880a1bf45e4
Author: Jordi Mas <jmas softcatala org>
Date:   Sat Jul 20 11:43:45 2019 +0200

    Documentation for Yandex API key

 help/C/translate.page | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/help/C/translate.page b/help/C/translate.page
index b2adfc6..9e2954c 100644
--- a/help/C/translate.page
+++ b/help/C/translate.page
@@ -39,6 +39,9 @@
     <item>
       <p>Select <gui style="button">Preferences</gui> to configure the translation engine to use and a 
language pair.</p>
     </item>
+    <item>
+      <p>In case you use the Yandex translation engine, you need an API key. You can obtain a free key at 
<link href="https://tech.yandex.com/translate/";>Yandex web site</link>.</p>
+    </item>
   </steps>
 
 </section>