Addendum to #274
Addendum to #274

Updates nestedMenu directive to notify the saver of changes. Still not
a final solution though (check the comment there).

latin-language-toolkit/arethusa,PonteIneptique/arethusa,PonteIneptique/arethusa,alpheios-project/arethusa,fbaumgardt/arethusa,Masoumeh/arethusa,latin-language-toolkit/arethusa,alpheios-project/arethusa,fbaumgardt/arethusa,Masoumeh/arethusa,fbaumgardt/arethusa,alpheios-project/arethusa