[Etoys] [Fix] translate classic navigator

[Yoshiki Ohshima]

> Button captions of classic navigator can be extracted into
> POs and translated with the patch attached.
> Though this is for squeakland-OLPC rather than EToys-OLPC,
> here it is anyway... 

  Thank you!

  With this patch, the definition of #makeButton:balloonText:for: at
ProjectNavigationMorph and ThreadNavigationMorph shouldn't send
#translated to the first argument, right?

-- Yoshiki