Add Greek (el) translation, from George Arslanoglou and Madarb, thanks! closes #1119

Originally committed to SVN as r4029.

aegisub/packages/osx_bundle/Contents/Info.plist

@@ -67,6 +67,7 @@
 		<string>cs</string>
 		<string>da</string>
 		<string>de</string>
+		<string>el</string>
 		<string>es</string>
 		<string>fi</string>
 		<string>fr_FR</string>

aegisub/po/LINGUAS

@@ -2,6 +2,7 @@ ca
 cs
 da
 de
+el
 es
 fi
 fr_FR

aegisub/src/aegisublocale.cpp

@@ -152,6 +152,7 @@ wxArrayInt AegisubLocale::GetAvailableLanguages() {
 		_T("cs"),
 		_T("da"),
 		_T("de"),
+		_T("el"),
 		_T("es"),
 		_T("fi"),
 		_T("fr_FR"),