[tor-bugs] #30435 [Internal Services/Service - jenkins]: Lektor builds in jenkins sometimes fail with templates problems

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#30435: Lektor builds in jenkins sometimes fail with templates problems
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     Reporter:  emmapeel                             |      Owner:  weasel
         Type:  defect                               |     Status:  new
     Priority:  Medium                               |  Milestone:
    Component:  Internal Services/Service - jenkins  |    Version:
     Severity:  Normal                               |   Keywords:
Actual Points:                                       |  Parent ID:
       Points:                                       |   Reviewer:
      Sponsor:                                       |
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 Some builds of lektor in jenkins fail with:

 jinja2.exceptions.UndefinedError: '_' is undefined

 But if you click on build now they usually build.

 It seems like if some machines had the software needed to compile, and
 some not. As in many other languages,  _ is the shortened expression for
 i18n, so it could be that the lektor-i18n plugin is missing? It looks like
 it installs, though, even if there is an error about 'wheels':

 09:16:52 Updating packages in
 /home/jenkins/.cache/lektor/packages/1b7e03f6dbb11eed7da0c1e12dd75608 for
 project
 09:16:52 Obtaining file:///srv/jenkins-workspace/workspace/lektor-website-
 tpo-translation/website/packages/i18n
 09:16:53 Installing collected packages: lektor-i18n
 09:16:53   Running setup.py develop for lektor-i18n
 09:16:53 Successfully installed lektor-i18n
 09:16:53 /usr/lib/python3/dist-
 packages/pip/_internal/commands/install.py:222: UserWarning: Disabling all
 use of wheels due to the use of --build-options / --global-options /
 --install-options.


 Example: https://jenkins.torproject.org/job/lektor-website-tpo-
 translation/448/consoleFull or most of failed builds at
 https://jenkins.torproject.org/job/lektor-website-tpo-translation

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30435>
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