delete page in the contextual menu (right click) doesn't work

When I right click on a page in the index and when I select "Supprimer la page" nothing happens. I'm using LANG="fr_FR.UTF-8". On the terminal and running with zim -D I see:
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.5/zim/gui/__init__.py", line 1041, in delete_page
    DeletePageDialog(self, path).run()
  File "/usr/lib/pymodules/python2.5/zim/gui/__init__.py", line 2296, in __init__
    'Remove links from %i pages linking to this page', i) % i
TypeError: not all arguments converted during string formatting

Strangely when I run it with LANG=C, then I get a confirmation prompt and when I confirm I get an error message "walk() got an unexpected keyword argument 'followlinks'" and I have to click a second time on "OK" but then it works.

In the terminal with zim -D I get this:
DEBUG: Action: delete_page
DEBUG: Pageindex has focus
DEBUG: Opening dialog "Delete Page - Zim"
DEBUG: Dialog response OK
DEBUG: Opening ProgressBarDialog
INFO: Remove file: /home/rhertzog/perso/notes/Notes/Test.txt
INFO: Remove file tree: /home/rhertzog/perso/notes/Notes/Test
DEBUG: Running ErrorDialog
ERROR: walk() got an unexpected keyword argument 'followlinks'
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.5/zim/gui/__init__.py", line 2317, in do_response_ok
    self.ui.notebook.delete_page(self.path, update_links, callback)
  File "/usr/lib/pymodules/python2.5/zim/notebook.py", line 1092, in delete_page
    store.delete_page(path)
  File "/usr/lib/pymodules/python2.5/zim/stores/files.py", line 134, in delete_page
    dir.remove_children()
  File "/usr/lib/pymodules/python2.5/zim/fs.py", line 633, in remove_children
    for root, dirs, files in os.walk(self.encodedpath, topdown=False, followlinks=False):
TypeError: walk() got an unexpected keyword argument 'followlinks'
DEBUG: Dialog response OK
DEBUG: Opening ProgressBarDialog
INFO: Open page: <FileStorePage: Notes:MindMapping> (<HistoryRecord: Notes:MindMapping>)
DEBUG: Closed dialog "Delete Page"

This is with zim 0.47-1 that I just uploaded to Debian and:
DEBUG: Gtk version is (2, 20, 1)
DEBUG: Pygtk version is (2, 17, 0)