about_viewer: "translators page" url updated.

app/src/main/res/values/about_viewer.xml

@@ -22,7 +22,7 @@
     <string name="about_xabber_github_url">https://github.com/redsolution/xabber-android</string>
 
     <string name="about_header_translators">Translators</string>
-    <string name="about_text_translators">Xabber is available in multiple languages thanks to many fine people from all over the world. We have created a <a href="https://github.com/redsolution/xabber-android/wiki/Top-translators">special page</a> on our website to acknowledge their efforts.\n\nYou may join their ranks and help us improve translation quality by <a href="https://crowdin.com/project/xabber/">contributing</a> your translations to Xabber project.</string>
+    <string name="about_text_translators">Xabber is available in multiple languages thanks to many fine people from all over the world. We have created a <a href="http://www.xabber.com/translators/">special page</a> on our website to acknowledge their efforts.\n\nYou may join their ranks and help us improve translation quality by <a href="https://crowdin.com/project/xabber/">contributing</a> your translations to Xabber project.</string>
 
     <string name="about_header_license">License</string>
     <string name="about_text_license">Xabber source code is licensed under GNU GPL v.3 license and is available on GitHub.\n\nGraphical images are licensed under Creative Commons Attribution Share-Alike (CC BY-SA) license.\n\nXabber &amp; Redsolution logo are property of Redsolution, Inc.\n\nMore detailed information on Xabber <a href="https://github.com/redsolution/xabber-android/blob/master/LICENSE">license file</a>.</string>