Pull request to merge changes by adding greek translation

* Added greek translation

* Updated greek translation by adding one additional string

* Updated translation string for better clarification

addon.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<addon id="plugin.video.youtube" name="YouTube" version="5.1.20.5" provider-name="bromix">
+<addon id="plugin.video.youtube" name="YouTube" version="5.1.20.6" provider-name="bromix">
 	<requires>
 		<import addon="xbmc.python" version="2.1.0"/>
 	</requires>
@@ -25,6 +25,8 @@
         <description lang="zh">「Youtube」是全世界最大的影片分享網站</description>
         <summary lang="bg">Добавка за YouTube</summary>
         <description lang="bg">YouTube е един от най-големите уеб сайтове за споделяне на видео в целия свят.</description>
+		<summary lang="el">Πρόσθετο YouTube</summary>
+        <description lang="el">Το YouTube είναι μία από τις μεγαλύτερες ιστοσελίδες διαμοιρασμού βίντεο στον κόσμο.</description>
 		<disclaimer lang="en"></disclaimer>
 		<language></language>
 		<platform>all</platform>

changelog.txt

@@ -1,3 +1,6 @@
+5.1.20.6 (2016-04-03)
+[add] Greek Translation
+
 5.1.20.5 (2016-03-20)
 [upd] Ignore if '.apps.googleusercontent.com' entered in API Id string in add-on settings