Use more navigator.status in navbar1 template
Use more navigator.status in navbar1 template

Avoids a lot of function calls, as we keep track of the possibility of
a next or previous sentence in a property of navigator.status now -
which is exposed in the NavigatorCtrl through navStat.

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