deluge crashes on start with KeyError: 'ngettext'

[Francesco]

Deluge crashes on startup, giving the output:

[frapox@tungsteno ~]$ deluge
Unable to initialize gettext/locale!
'ngettext'
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/deluge/i18n/util.py", line 118, in setup_translation
    builtins.__dict__['_n'] = builtins.__dict__['ngettext']
KeyError: 'ngettext'

according to this post of the upstream the fix is altready done and could be backported from development branch:
https://forum.deluge-torrent.org/viewtopic.php?f=7&t=55673&sid=a323646bbfb243207bcdaa15ab546827

Info about my system:

[frapox@tungsteno ~]$ lsb_release -rd
Description: Ubuntu 20.04 LTS
Release: 20.04

[frapox@tungsteno ~]$ apt-cache policy deluge
deluge:
  Installato: 2.0.3-2
  Candidato: 2.0.3-2
  Tabella versione:
 *** 2.0.3-2 500
        500 http://ubuntu.mirror.garr.it/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: deluge 2.0.3-2
ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
Uname: Linux 5.4.0-33-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu May 28 08:57:06 2020
PackageArchitecture: all
SourcePackage: deluge
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.