feat: show absolute dates for more distant timestamps

[nijel]

The values like "month ago" don't give really a good idea when the change happened.

Work in progress: This needs user selectable timezone to make it nicer to user.

[github-actions]

This pull request has been automatically marked as stale because there wasn’t any recent activity.

It will be closed soon if no further action occurs.

Thank you for your contributions!

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
5136	1	5135	663

View the full list of 1 ❄️ flaky test(s)

weblate.trans.tests.test_templatetags.NaturalTimeTest::test_natural

Flake rate in main: 12.40% (Passed 106 times, Failed 15 times)

Stack Traces | 0.017s run time

self = <weblate.trans.tests.test_templatetags.NaturalTimeTest testMethod=test_natural>

    def test_natural(self) -> None:
        now = timezone.now()
        for diff, expected in TEST_DATA:
            testdate = now + datetime.timedelta(seconds=diff)
            result = naturaltime(testdate, now=now)
            expected = format_html(
                '<span title="{}">{}</span>',
                testdate.replace(microsecond=0).isoformat(),
                expected,
            )
>           self.assertEqual(
                expected,
                result,
                f"naturaltime({testdate}) {result!r} != {expected!r}",
            )
E           AssertionError: '<span title="2025-11-10T07:35:08+00:00">now</span>' != '<span title="2025-11-10T07:35:08+00:00">11/10/2025 7:35 a.m.</span>' : naturaltime(2025-11-10 07:35:08.504429+00:00) '<span title="2025-11-10T07:35:08+00:00">11/10/2025 7:35 a.m.</span>' != '<span title="2025-11-10T07:35:08+00:00">now</span>'

.../trans/tests/test_templatetags.py:73: AssertionError

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