l10n Minor language corrections.

From translation svn rev:11070
Revert "TreeInterceptor._get_passThrough: return true  if isAlive is false, even if _passThrough is false. This means that until a treeInterceptor is ready, passThrough will be considered on." (Reopens) Re #3388. Fixes #3446.

This reverts commit fde2dcbc9613ec0ddc991f798bbf9230ff6116ad.
api.setNavigatorObject: only switch review modes from object to document if the treeInterceptor is ready. Fixes #3388.
gecko_ia2 vbuf backend: Fix nasty typo that was causing Gecko 1.x (e.g. Firefox 3.6) to crash.

Fixes #3456.
l10n Minor language corrections.

From translation svn rev:11092
Merge branch 'rc' of git://git.nvaccess.org/nvda into release-2013.2jp