Merge pull request #7247 from Sage/FE-7111

fix(form): correct pluralisation on form summary when single error and warning

Author: nuria1110

src/components/form/form-test.stories.tsx

@@ -527,7 +527,7 @@ export const FullWidthWithLeftAndRight = () => {
           Other
         </Button>
       }
-      errorCount={3}
+      errorCount={1}
       warningCount={2}
     >
       <Textbox label="Textbox" />

src/locales/en-gb.ts

@@ -71,7 +71,7 @@ const enGB: Locale = {
         (errors, warnings, type) => {
           const errorPlural = isSingular(errors) ? "error" : "errors";
           const warningPlural = isSingular(warnings) ? "warning" : "warnings";
-          const isErrorPlural = isSingular(errors) && !warnings ? "is" : "are";
+          const isErrorPlural = isSingular(errors) ? "is" : "are";
           const isWarningPlural = isSingular(warnings) ? "is" : "are";
 
           if (errors && warnings && type === "warning") {