Fix crowdin tool for Python 2

docker run --rm -it ghcr.io/jenkins-x/builder-python37:latest bash -c "git clone https://github.com/nuxeo/tools-nuxeo-crowdin.git crowdin; cd crowdin; python -m pip install --user -r requirements.txt"

Cloning into 'crowdin'...
remote: Enumerating objects: 308, done.
remote: Counting objects: 100% (30/30), done.
remote: Compressing objects: 100% (23/23), done.
remote: Total 308 (delta 15), reused 15 (delta 7), pack-reused 278
Receiving objects: 100% (308/308), 58.88 KiB | 744.00 KiB/s, done.
Resolving deltas: 100% (181/181), done.
Collecting argparse==1.4.0 (from -r requirements.txt (line 1))
  Downloading https://files.pythonhosted.org/packages/f2/94/3af39d34be01a24a6e65433d19e107099374224905f1e0cc6bbe1fd22a2f/argparse-1.4.0-py2.py3-none-any.whl
Collecting nose==1.3.7 (from -r requirements.txt (line 2))
  Downloading https://files.pythonhosted.org/packages/99/4f/13fb671119e65c4dce97c60e67d3fd9e6f7f809f2b307e2611f4701205cb/nose-1.3.7-py2-none-any.whl (154kB)
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Collecting requests==2.20.0 (from -r requirements.txt (line 3))
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Collecting pytest==4.6.3 (from -r requirements.txt (line 4))
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Collecting urllib3<1.25,>=1.21.1 (from requests==2.20.0->-r requirements.txt (line 3))
  Cache entry deserialization failed, entry ignored
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Collecting chardet<3.1.0,>=3.0.2 (from requests==2.20.0->-r requirements.txt (line 3))
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Collecting idna<2.8,>=2.5 (from requests==2.20.0->-r requirements.txt (line 3))
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Requirement already satisfied (use --upgrade to upgrade): certifi>=2017.4.17 in /usr/lib/python2.7/site-packages (from requests==2.20.0->-r requirements.txt (line 3))
Collecting atomicwrites>=1.0 (from pytest==4.6.3->-r requirements.txt (line 4))
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Collecting packaging (from pytest==4.6.3->-r requirements.txt (line 4))
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Collecting wcwidth (from pytest==4.6.3->-r requirements.txt (line 4))
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Collecting py>=1.5.0 (from pytest==4.6.3->-r requirements.txt (line 4))
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Requirement already satisfied (use --upgrade to upgrade): importlib-metadata>=0.12 in /usr/lib/python2.7/site-packages (from pytest==4.6.3->-r requirements.txt (line 4))
Requirement already satisfied (use --upgrade to upgrade): six>=1.10.0 in /usr/lib/python2.7/site-packages (from pytest==4.6.3->-r requirements.txt (line 4))
Requirement already satisfied (use --upgrade to upgrade): pathlib2>=2.2.0; python_version < "3.6" in /usr/lib/python2.7/site-packages (from pytest==4.6.3->-r requirements.txt (line 4))
Collecting pluggy<1.0,>=0.12 (from pytest==4.6.3->-r requirements.txt (line 4))
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Collecting funcsigs>=1.0; python_version < "3.0" (from pytest==4.6.3->-r requirements.txt (line 4))
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Collecting attrs>=17.4.0 (from pytest==4.6.3->-r requirements.txt (line 4))
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Collecting more-itertools<6.0.0,>=4.0.0; python_version <= "2.7" (from pytest==4.6.3->-r requirements.txt (line 4))
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Collecting pyparsing!=3.0.5,>=2.0.2 (from packaging->pytest==4.6.3->-r requirements.txt (line 4))
  Downloading https://files.pythonhosted.org/packages/ab/61/1a1613e3dcca483a7aa9d446cb4614e6425eb853b90db131c305bd9674cb/pyparsing-3.0.6.tar.gz (882kB)
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    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-fapeFo/pyparsing/setup.py", line 8, in <module>
        from pyparsing import __version__ as pyparsing_version
      File "pyparsing/__init__.py", line 100
        major: int
             ^
    SyntaxError: invalid syntax
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-fapeFo/pyparsing/
You are using pip version 8.1.2, however version 21.3.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.