feat: localization of core/exchange - #1638

Localization: core/exchange

Overview

• Feature: lib/core/exchange/domain/errors/
• Strings localized: 12 new ARB keys + toTranslated() methods for 4 error classes
• Files modified: 7 (4 Dart files + 3 ARB files)
• Branch: localization/core-exchange

Changes

• Added toTranslated(BuildContext context) method to all 4 error classes
• Added ARB keys with existing feature-prefix naming convention
• Validated with validation scripts
• Tested with flutter analyze

Implementation Pattern

Following the same toTranslated() method pattern as BitBoxError:

• Error classes now have a toTranslated(BuildContext context) method
• UI code can call error.toTranslated(context) for localized display
• unexpected error types pass through their message directly

Modified Error Classes

1. BuyError - Added toTranslated() with 7 error types
2. SellError - Added toTranslated() with 7 error types
3. PayError - Added toTranslated() with 7 error types
4. WithdrawError - Added toTranslated() with 6 error types

New ARB Keys (12)

Buy Errors:

• buyUnauthenticatedError, buyBelowMinAmountError, buyAboveMaxAmountError
• buyInsufficientFundsError, buyOrderNotFoundError, buyOrderAlreadyConfirmedError

Withdraw Errors:

• withdrawUnauthenticatedError, withdrawBelowMinAmountError, withdrawAboveMaxAmountError
• withdrawOrderNotFoundError, withdrawOrderAlreadyConfirmedError

Note: Sell and Pay error keys already existed in ARB files.

Validation Results

✅ validate_localizations.py - All 2685 keys synchronized
✅ flutter analyze --fatal-warnings --fatal-infos - No issues found

Testing

• All localization keys exist in ARB files
• Changed files pass flutter analyze
• Follows existing naming conventions (feature-prefix for feature-consumed errors)