CI/CD

Update El Salvador holidays, add l10n support #5394

Job	Run time
Run pre-commit	35s
CodeQL	1m 16s
Test Python 3.9 on macos-latest	54s
Test Python 3.10 on macos-latest	52s
Test Python 3.11 on macos-latest	50s
Test Python 3.12 on macos-latest	59s
Test Python 3.13 on macos-latest	33s
Test Python 3.9 on ubuntu-latest	1m 1s
Test Python 3.10 on ubuntu-latest	1m 3s
Test Python 3.11 on ubuntu-latest	56s
Test Python 3.12 on ubuntu-latest	1m 16s
Test Python 3.13 on ubuntu-latest	1m 13s
Test Python 3.9 on windows-latest	1m 55s
Test Python 3.10 on windows-latest	1m 59s
Test Python 3.11 on windows-latest	1m 41s
Test Python 3.12 on windows-latest	2m 0s
Test Python 3.13 on windows-latest	2m 11s
Build distribution	24s
Test docs build	36s
Test build on macos-latest	26s
Test build on ubuntu-latest	48s
Test build on windows-latest	2m 58s
Publish generated artifacts	0s
Create SHA1 checksums and Sigstore signatures	0s
Update GitHub release with SBOM and signed artifacts	0s
	26m 26s

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