GTranslators UI is not created completely

If I'm starting GTranslator I get a lot of warnings and critical messages from GLib and the shown UI is incomplete. Some menus and the whole editor (or translating) component is missing (see attachment).

$ LANGUAGE=en gdb --args gtranslator de.po
GNU gdb (GDB) 7.5-ubuntu
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/gtranslator...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/bin/gtranslator de.po
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[New Thread 0xb66efb40 (LWP 16921)]
[New Thread 0xb5eeeb40 (LWP 16922)]
[New Thread 0xaf47ab40 (LWP 16923)]

(gtranslator:16917): GLib-GObject-WARNING **: cannot register existing type `GtrWindow'

(gtranslator:16917): GLib-CRITICAL **: g_once_init_leave: assertion `result != 0' failed

(gtranslator:16917): GLib-GObject-CRITICAL **: g_param_spec_object: assertion `g_type_is_a (object_type, G_TYPE_OBJECT)' failed

(gtranslator:16917): GLib-GObject-CRITICAL **: g_object_interface_install_property: assertion `G_IS_PARAM_SPEC (pspec)' failed

(gtranslator:16917): libpeas-WARNING **: _valist_to_parameter_list: type 'GtrWindowActivatable' has no property named 'window'

(gtranslator:16917): libpeas-CRITICAL **: peas_extension_set_foreach: assertion `PEAS_IS_EXTENSION_SET (set)' failed

(gtranslator:16917): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(gtranslator:16917): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(gtranslator:16917): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(gtranslator:16917): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 9: reading configurations from ~/.fonts.conf is deprecated.

(gtranslator:16917): GLib-GObject-WARNING **: cannot register existing type `GtrTab'

(gtranslator:16917): GLib-CRITICAL **: g_once_init_leave: assertion `result != 0' failed

(gtranslator:16917): GLib-GObject-CRITICAL **: g_param_spec_object: assertion `g_type_is_a (object_type, G_TYPE_OBJECT)' failed

(gtranslator:16917): GLib-GObject-CRITICAL **: g_object_interface_install_property: assertion `G_IS_PARAM_SPEC (pspec)' failed

(gtranslator:16917): libpeas-WARNING **: _valist_to_parameter_list: type 'GtrTabActivatable' has no property named 'tab'

(gtranslator:16917): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(gtranslator:16917): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(gtranslator:16917): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(gtranslator:16917): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(gtranslator:16917): libpeas-CRITICAL **: peas_extension_set_foreach: assertion `PEAS_IS_EXTENSION_SET (set)' failed

(gtranslator:16917): libpeas-CRITICAL **: peas_extension_set_foreach: assertion `PEAS_IS_EXTENSION_SET (set)' failed

(gtranslator:16917): libpeas-CRITICAL **: peas_extension_set_foreach: assertion `PEAS_IS_EXTENSION_SET (set)' failed

(gtranslator:16917): libpeas-CRITICAL **: peas_extension_set_foreach: assertion `PEAS_IS_EXTENSION_SET (set)' failed

(gtranslator:16917): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

(gtranslator:16917): Gdl-CRITICAL **: gdl_dock_layout_save_layout: assertion `layout != NULL' failed

(gtranslator:16917): Gdl-CRITICAL **: gdl_dock_layout_save_to_file: assertion `layout != NULL' failed

** (gtranslator:16917): WARNING **: Saving dock layout to '/home/bmh1980/.config/gtranslator/layout.xml' failed!

(gtranslator:16917): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
[Thread 0xaf47ab40 (LWP 16923) exited]
[Thread 0xb66efb40 (LWP 16921) exited]
[Thread 0xb5eeeb40 (LWP 16922) exited]
[Inferior 1 (process 16917) exited normally]
(gdb) quit

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: gtranslator 2.91.5-1build1
ProcVersionSignature: Ubuntu 3.5.0-20.31-generic 3.5.7.1
Uname: Linux 3.5.0-20-generic i686
ApportVersion: 2.6.1-0ubuntu9
Architecture: i386
Date: Sun Dec 9 15:42:17 2012
InstallationDate: Installed on 2011-05-13 (575 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
MarkForUpload: True
SourcePackage: gtranslator
UpgradeStatus: Upgraded to quantal on 2012-10-19 (51 days ago)