MenuViewHelper does not hide untranslated pages

[mbrodala]

We have set up our site with the following to ensure no default content is displayed on translated pages:

config {
  sys_language_overlay = 0
  sys_language_mode = strict
}

However, the MenuViewHelper does not respect this and in fact always falls back to including pages from the default language in the menu.

This is caused by PageService::getMenu() which filters the menu pages by PageService::hidePageForLanguageUid() but does not offer an option to disable the $normalWhenNoLanguage flag.

[mbrodala]

A long time ago the behavior we need was default but this was changed with #392.