Localization: fix simulator localizations not being picked up in debug mode

[atmamont]

Summary

This PR:

• fixes the current "legacy" localization resolution in debug/simulator runs where missing strings can be surfaced as uppercased keys instead of falling through to the expected fallback layers. The resolver now keeps treating those debug placeholders as missing values, so localization continues through the existing fallback chain instead of rendering raw localization keys in the UI. This allows us to use Simulator debug capabilities to find missing localizations. This is also addressed in an automated way by introducing localization coverage unit tests

Demo

Debug localizations ON before the fix	Debug localizations ON after the fix

Technical Information

Main localization logic changes in this PR:

• preserve and document the current legacy fallback order: Bundle.main -> optional LocalizationParameters.bundle -> SDK localized resources -> SDK en-US -> raw key
• keep enforced-locale resolution working by reading the requested .lproj from each candidate bundle before falling back to SDK resources
• treat Xcode's Show non-localized strings uppercase placeholder output as a missing translation so fallback continues correctly
• keep custom table and key-separator lookup behavior unchanged
• add focused localization test coverage for the debug placeholder case

Testing Instructions

• Enable Xcode's debug option to show non-localized strings for AdyenUIHost
• Launch the Demo app and open a flow that renders SDK-owned strings such as the preselected payment method screen
• Verify missing app-level translations no longer render as raw localization keys and instead fall back to the SDK translation chain
• Run LocalizationTests and confirm the debug placeholder case passes

Ticket

COSDK-1097

Checklist

• Tested changes locally
• Added/updated unit tests
• Verified against acceptance criteria

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a critical issue where localization strings were not being correctly loaded and applied within the simulator environment during debug sessions. The fix involved a strategic migration of localization resources from the modern .xcstrings format back to the more traditional .strings format, coupled with necessary updates to the Xcode project configuration to ensure these files are properly recognized and bundled. This change ensures that localized content is correctly displayed in the simulator, improving the debugging experience for internationalized applications.

Highlights

• Localization File Migration: Migrated localization files from the newer .xcstrings format to the traditional .strings format to address loading issues.
• Xcode Project Configuration Update: Updated the Xcode project file (project.pbxproj) to correctly reference the newly introduced .strings localization files and their respective language-specific bundles.
• Simulator Localization Fix: Resolved an issue where localization strings were not being correctly picked up and displayed in the simulator during debug mode.

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[gemini-code-assist]

Code Review

This pull request migrates the localization files from the .xcstrings format to the traditional .strings format. This includes deleting the old Localizable.xcstrings file, creating new Localizable.strings files for English and Hindi with the extracted string content, and updating the Xcode project file (Adyen.xcodeproj/project.pbxproj) to reference these new .strings files and their variant group. There are no review comments to address.

[github-actions]

ℹ️ No baseline data found for 'feature/cosdk-1097-ios-v6-custom-localization-develop'.

Framework	Size
AdyenComponents.framework	2828 KB
AdyenActions.framework	2404 KB
AdyenDropIn.framework	1361 KB
AdyenDelegatedAuthentication.framework	98 KB
AdyenAuthentication.framework	347 KB
AdyenWeChatPay.framework	266 KB
AdyenUI.framework	3347 KB
AdyenCardScanner.framework	699 KB
AdyenEncryption.framework	508 KB
AdyenSession.framework	753 KB
AdyenTwint.framework	282 KB
AdyenWeChatPayInternal.framework	4135 KB
AdyenCheckout.framework	2093 KB
AdyenCashAppPay.framework	1779 KB
AdyenCard.framework	1753 KB
TwintSDK.framework	97 KB
Adyen3DS2.framework	919 KB
Adyen.framework	5064 KB
total	28733 KB

[github-actions]

✅ No changes detected

Comparing chore/fix-simulator-localizations to feature/cosdk-1097-ios-v6-custom-localization-develop

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Analyzed targets: Adyen, AdyenActions, AdyenCard, AdyenCardScanner, AdyenCashAppPay, AdyenCheckout, AdyenComponents, AdyenDelegatedAuthentication, AdyenDropIn, AdyenEncryption, AdyenSession, AdyenSwiftUI, AdyenTwint, AdyenUI, AdyenWeChatPay