changed Greek name to use Greek letters

Author: NSoiffer

addon/globalPlugins/MathCAT/MathCATPreferences.py

@@ -108,7 +108,7 @@ def LanguagesDict():
             "dv": "ދިވެހިބަސް",
             "dz": "རྫོང་ཁ",
             "ee": "Ɛʋɛ",
-            "el": "Ellêniká",
+            "el": "Ελληνικά",
             "en": "English",
             "eo": "Esperanto",
             "es": "Español",