Wait until after widgets have been set up to handle change signals

https://bugzilla.gnome.org/show_bug.cgi?id=682372
Make getting extension more robust

Ensure the basename and extension have at least one char each.
Don't show the open with tab if it is going to be useless
Use quotes consistently for error dialogs
po/vi: imported from Damned Lies
Updated Vietnamese translation
Updated Traditional Chinese translation(Hong Kong and Taiwan)
ui: add back keybindings for Back/Forward/Up

These got lost during the menu layout rework.

https://bugzilla.gnome.org/show_bug.cgi?id=679822
https://bugzilla.gnome.org/show_bug.cgi?id=680250
mime-application-chooser: always take a list of NautilusFiles

This has the following consequences:
- fixes the build after commit 58b704ad8b473600d7f7ad57aa5535e5be5dbd24
- take a ref to the NautilusFiles when the list is passed-in
- simplifies the code calling the dialog from NautilusPropertiesWindow
- simplifies the code in NautilusMimeApplicationChooser, since we don't
  have to special case the files != NULL case and build a GFile manually
  from the URI
toolbar: don't use deprecated gtk_menu_button_set_menu()
actions: remove unused UpAccel action
ui: re-add accelerator for "Go Home" action

This was also lost during the menu relayout.
actions: cleanup unused actions from the action group

And ensure name defines are used instead of plain strings, where
possible.
window: simplify toolbar actions creation

Instead of having the toolbar create a different action group, with
different actions, and having to keep those in sync with the window's
main action group manually, just pass the main action group to the
toolbar.
This also makes NautilusNavigationState useless (and removes a lot of
boilerplate code), and fixes Ctrl+1/Ctrl+2 not working correctly as
shorcuts to switch view type.
toolbar: restore history context menu on navigation action buttons

This code stopped working when we changed the way we build the toolbar
layout; take this as an occasion to remove NautilusNavigationAction and
folding the menu code into NautilusToolbar (where the buttons live).
Updated Spanish translation
Updated Polish translation
file: fix leaked trash_orig_path

https://bugzilla.gnome.org/show_bug.cgi?id=682603
update_restore_from_trash_action: fix leaked tooltip

https://bugzilla.gnome.org/show_bug.cgi?id=682603
query: fix leaked location_uri

https://bugzilla.gnome.org/show_bug.cgi?id=682603