Comment 3 for bug 1825213

similar problem here

(menulibre:10876): Gtk-WARNING **: 11:31:43.437: gtk_menu_attach_to_widget(): menu already attached to GtkMenuButton

(menulibre:10876): Gtk-WARNING **: 11:31:43.501: gtk_menu_attach_to_widget(): menu already attached to GtkMenuButton
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/menulibre/MenulibreApplication.py", line 2217, in do_activate
    self.win = MenulibreWindow(self, headerbar)
  File "/usr/lib/python3/dist-packages/menulibre/MenulibreApplication.py", line 250, in __init__
    self.configure_application_treeview(builder)
  File "/usr/lib/python3/dist-packages/menulibre/MenulibreApplication.py", line 589, in configure_application_treeview
    self.treeview = MenulibreTreeview.Treeview(self, builder)
  File "/usr/lib/python3/dist-packages/menulibre/MenulibreTreeview.py", line 48, in __init__
    self._configure_treeview(builder)
  File "/usr/lib/python3/dist-packages/menulibre/MenulibreTreeview.py", line 59, in _configure_treeview
    treestore = MenuEditor.get_treestore()
  File "/usr/lib/python3/dist-packages/menulibre/MenuEditor.py", line 123, in get_treestore
    return menu_to_treestore(treestore, None, menu)
  File "/usr/lib/python3/dist-packages/menulibre/MenuEditor.py", line 111, in menu_to_treestore
    treestore = menu_to_treestore(treestore, treeiter, item[3])
  File "/usr/lib/python3/dist-packages/menulibre/MenuEditor.py", line 100, in menu_to_treestore
    tooltip = escapeText(item[2]['comment'])
  File "/usr/lib/python3/dist-packages/menulibre/util.py", line 99, in escapeText
    return GLib.markup_escape_text(text, len(text))
  File "/usr/lib/python3/dist-packages/gi/overrides/GLib.py", line 415, in markup_escape_text
    return GLib.markup_escape_text(text, length)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc3 in position 77: unexpected end of data
^C

switching system language from german to english is no option for me.