Feature/handle currency pair inconsistency in yahoo finance service (#1069)

* Handle occasional currency pair inconsistency: GBP=X instead of USDGBP=X

* Update changelog

CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Extended the investment timeline grouped by month
 
+### Changed
+
+- Handled an occasional currency pair inconsistency in the _Yahoo Finance_ service (`GBP=X` instead of `USDGBP=X`)
+
 ### Fixed
 
 - Fixed the content height of the account detail dialog

apps/api/src/services/data-provider/yahoo-finance/yahoo-finance.service.ts

@@ -37,10 +37,15 @@ export class YahooFinanceService implements DataProviderInterface {
   }
 
   public convertFromYahooFinanceSymbol(aYahooFinanceSymbol: string) {
-    const symbol = aYahooFinanceSymbol.replace(
+    let symbol = aYahooFinanceSymbol.replace(
       new RegExp(`-${this.baseCurrency}$`),
       this.baseCurrency
     );
+
+    if (symbol.includes('=X') && !symbol.includes(this.baseCurrency)) {
+      symbol = `${this.baseCurrency}${symbol}`;
+    }
+
     return symbol.replace('=X', '');
   }