feat: enhance localization methods to use SDK's active locale for plural rules

[serhii-londar]

No description provided.

[Copilot]

Pull request overview

Enhances the String localization helpers so formatted localization (including .stringsdict plural resolution) uses the SDK’s active localization locale instead of the device locale.

Changes:

• Update cw_localized(with:) overloads to call String(format:locale:arguments:) with an SDK-derived Locale.
• Add a private String.crowdinLocale helper to derive the locale from the SDK’s current localization (with fallback).

[codecov]

Codecov Report

❌ Patch coverage is 1.17647% with 84 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.58%. Comparing base (30455af) to head (8096376).

Files with missing lines	Patch %	Lines
Sources/Tests/Core/CrowdinLocaleTests.swift	0.00%	78 Missing ⚠️
...rces/CrowdinSDK/CrowdinSDK/Extensions/String.swift	14.29%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #391      +/-   ##
==========================================
- Coverage   57.30%   56.58%   -0.71%     
==========================================
  Files         134      135       +1     
  Lines        6540     6623      +83     
==========================================
  Hits         3747     3747              
- Misses       2793     2876      +83     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.