Added v. 9.0.0 to CHANGELOG

[tombogle]

Also updated copyright year to 2026 and replaced use of deprecated CodeBase with Location (in tests).

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This change is 

[andrew-polk]

@andrew-polk reviewed 3 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @aror92 and @mark-sil).

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src/L10NSharp.Windows.Forms.Tests/ILocalizableComponentTests.cs line 29 at r1 (raw file):

		protected void TestSetup(string installedTranslationDir)
		{
			var dir = Path.GetDirectoryName(new Uri(Assembly.GetExecutingAssembly().Location).LocalPath);

Looks fine and feel free to merge if you want, but devin review caught this:

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CodeBase to Location migration is correct but creates codebase inconsistency

The change from Assembly.GetExecutingAssembly().CodeBase to Assembly.GetExecutingAssembly().Location at ILocalizableComponentTests.cs:29 is a valid modernization since CodeBase is obsolete in .NET 5+. The pattern new Uri(Location).LocalPath works because the Uri constructor recognizes absolute Windows file paths (like C:\path\to\assembly.dll) and converts them to file:// URIs internally.

However, this creates an inconsistency in the codebase - other test files still use the old CodeBase pattern:

• XLiffUtilsTests.cs:16 uses Assembly.GetExecutingAssembly().CodeBase.Replace("file://", String.Empty)
• LocalizationManagerXliffTests.cs:41 uses new Uri(Assembly.GetExecutingAssembly().CodeBase).LocalPath
• XLiffSchemaValidationTests.cs:21 uses new Uri(Assembly.GetExecutingAssembly().CodeBase).LocalPath

These should likely be updated for consistency and to avoid obsolete API warnings when targeting .NET 5+.

[andrew-polk]

@andrew-polk reviewed 4 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @aror92 and @mark-sil).

[github-actions]

Test Results

    6 files  ±0    84 suites  ±0   28s ⏱️ +8s
165 tests ±0  160 ✔️ +1    5 💤 ±0  0 ❌  - 1 
495 runs  ±0  480 ✔️ +1  15 💤 ±0  0 ❌  - 1 

Results for commit 3b42806. ± Comparison against base commit 3eeffa1.