TF-4029 Fix singular vs plural for attachments

lib/features/email/presentation/utils/email_action_reactor/email_action_reactor.dart

@@ -408,7 +408,9 @@ class EmailActionReactor {
         ccPrefix: appLocalizations.cc_email_address_prefix,
         bccPrefix: appLocalizations.bcc_email_address_prefix,
         replyToPrefix: appLocalizations.replyToEmailAddressPrefix,
-        titleAttachment: appLocalizations.attachments.toLowerCase(),
+        titleAttachment: emailLoaded.attachments.length > 1
+          ? appLocalizations.attachments.toLowerCase()
+          : appLocalizations.attachment.toLowerCase(),
         toAddress: presentationEmail.to?.listEmailAddressToString(isFullEmailAddress: true),
         ccAddress: presentationEmail.cc?.listEmailAddressToString(isFullEmailAddress: true),
         bccAddress: presentationEmail.bcc?.listEmailAddressToString(isFullEmailAddress: true),

lib/features/email/presentation/widgets/attachments_info.dart

@@ -38,10 +38,15 @@ class AttachmentsInfo extends StatelessWidget {
     );
 
     final titleHeaderAttachment = Text(
-      AppLocalizations.of(context).titleHeaderAttachment(
-        numberOfAttachments,
-        totalSizeInfo,
-      ),
+      numberOfAttachments > 1
+        ? AppLocalizations.of(context).titleHeaderAttachment(
+            numberOfAttachments,
+            totalSizeInfo,
+          )
+        : AppLocalizations.of(context).singularAttachmentTitleHeader(
+            numberOfAttachments,
+            totalSizeInfo,
+          ),
       maxLines: 1,
       overflow: TextOverflow.ellipsis,
       style: ThemeUtils.textStyleInter400.copyWith(