feat: enhance localization handling by adding xcstringsParsingKey method and updating parsing logic

[serhii-londar]

No description provided.

[Copilot]

Pull request overview

This PR improves how the SDK resolves the localization key used when parsing .xcstrings files, particularly to support Crowdin custom languages whose folder locale can differ from the locale stored inside the xcstrings JSON.

Changes:

• Add ManifestManager.xcstringsParsingKey(for:) to derive the correct xcstrings localization key (custom vs standard languages).
• Update .xcstrings parsing and download flow to use the derived parsing key instead of the raw iOS localization value.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
Sources/CrowdinSDK/Providers/Crowdin/ManifestManager/ManifestManager+LanguageResolver.swift	Introduces xcstringsParsingKey(for:) to map an iOS localization to the key used inside .xcstrings files (custom-language aware).
Sources/CrowdinSDK/Providers/Crowdin/LocalizationDownloader/CrowdinLocalizationDownloader.swift	Uses xcstringsParsingKey(for:) when parsing cached xcstrings and when downloading/parsing xcstrings files.

Comments suppressed due to low confidence (1)

Sources/CrowdinSDK/Providers/Crowdin/LocalizationDownloader/CrowdinLocalizationDownloader.swift:88

• Typo in local variable name: xcStringsFilesToDownlaod is misspelled, which makes the code harder to read/search. Rename to xcStringsFilesToDownload (and update references) for clarity.

                let xcStringsFilesToDownlaod = xcstringsFiles.filter({ self.manifestManager.hasFileChanged(filePath: $0, localization: self.manifestManager.xcstringsLanguage) })
                let filesToDownload = xcStringsFilesToDownlaod + notXcstringsFilesToDownload

[codecov]

Codecov Report

❌ Patch coverage is 3.52941% with 82 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.60%. Comparing base (30455af) to head (171259d).

Files with missing lines	Patch %	Lines
...s/Tests/CrowdinProvider/ManifestManagerTests.swift	0.00%	65 Missing ⚠️
...festManager/ManifestManager+LanguageResolver.swift	0.00%	16 Missing ⚠️
...tionDownloader/CrowdinLocalizationDownloader.swift	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #394      +/-   ##
==========================================
- Coverage   57.30%   56.60%   -0.69%     
==========================================
  Files         134      134              
  Lines        6540     6622      +82     
==========================================
+ Hits         3747     3748       +1     
- Misses       2793     2874      +81     

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