Introduce observed_estimated_label

[arkid15r]

Proposed change

While reviewing #1615 I noticed cases with the extra brackets "(estimated) (observed)" label text inconsistency. This PR is aimed to address the first problem.

Type of change

• New country/market holidays support (thank you!)
• Supported country/market holidays update (calendar discrepancy fix, localization)
• Existing code/documentation/test/process quality improvement (best practice, cleanup, refactoring, optimization)
• Dependency update (version deprecation/upgrade)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (a code change causing existing functionality to break)
• New feature (new python-holidays functionality in general)

Checklist

• I've followed the contributing guidelines
• I've run make pre-commit, it didn't generate any changes
• I've run make test, all tests passed locally

[coveralls]

Pull Request Test Coverage Report for Build 7465501273

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

---

Totals
Change from base Build 7451812408:	0.0%
Covered Lines:	10269
Relevant Lines:	10269

---

💛 - Coveralls

[KJhellico]

i18n support is something awesome... 🤪

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[arkid15r]

I've addressed the comments and added an extra check for estimated/observed_estimated labels

[KJhellico]

LGTM!