gh-126727: Fix locale.nl_langinfo(locale.ERA)

[serhiy-storchaka]

It now returns multiple era description segments separated by semicolons. Previously it only returned the first segment on platforms with Glibc.

• Issue: locale.nl_langinfo(locale.ERA) does not work for past eras #126727

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📚 Documentation preview 📚: https://cpython-previews--126730.org.readthedocs.build/

[miss-islington-app]

Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.12, 3.13.
🐍🍒⛏🤖

[miss-islington-app]

Sorry, @serhiy-storchaka, I could not cleanly backport this to 3.13 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 4803cd0244847f286641c85591fda08b513cea52 3.13

[miss-islington-app]

Sorry, @serhiy-storchaka, I could not cleanly backport this to 3.12 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 4803cd0244847f286641c85591fda08b513cea52 3.12

[bedevere-app]

GH-127097 is a backport of this pull request to the 3.13 branch.

[bedevere-app]

GH-127098 is a backport of this pull request to the 3.12 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 Android 3.x has failed when building commit 4803cd0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1594/builds/635) and take a look at the build logs.
4. Check if the failure is related to this commit (4803cd0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1594/builds/635

Failed tests:

• test_os

Failed subtests:

• test_timerfd_ns_poll - test.test_os.TimerfdTests.test_timerfd_ns_poll
• test_timerfd_poll - test.test_os.TimerfdTests.test_timerfd_poll

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/data/user/0/org.python.testbed/files/python/lib/python3.14/test/test_os.py", line 4391, in test_timerfd_poll
    self.check_timerfd_poll(False)
    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^
  File "/data/user/0/org.python.testbed/files/python/lib/python3.14/test/test_os.py", line 4379, in check_timerfd_poll
    self.assertEqual(self.read_count_signaled(fd), 1)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 2 != 1


Traceback (most recent call last):
  File "/data/user/0/org.python.testbed/files/python/lib/python3.14/test/test_os.py", line 4394, in test_timerfd_ns_poll
    self.check_timerfd_poll(True)
    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/data/user/0/org.python.testbed/files/python/lib/python3.14/test/test_os.py", line 4379, in check_timerfd_poll
    self.assertEqual(self.read_count_signaled(fd), 1)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 2 != 1

[vstinner]

test_timerfd_ns_poll - test.test_os.TimerfdTests.test_timerfd_ns_poll
test_timerfd_poll - test.test_os.TimerfdTests.test_timerfd_poll

It's unrelated to this change: that's issue gh-gh-124873. I proposed a fix: #127101