Pontoon/AMO Frontend: Update Greek (el)

Co-authored-by: Jim Spentzos <[email protected]> (el)

Author: mozilla-pontoon

locale/el/LC_MESSAGES/amo.po

@@ -3165,7 +3165,7 @@ msgstr ""
 
 #: src/amo/pages/UserProfile/index.js:308
 msgid "User Avatar"
-msgstr "Avatar χρήστη"
+msgstr "Εικόνα χρήστη"
 
 #: src/amo/pages/UserProfile/index.js:315
 msgid "Add-ons developer"