Update translation to include + sign

- update tests to be stronger

ee/app/assets/javascripts/security_dashboard/components/vulnerability_list.vue

@@ -342,8 +342,7 @@ export default {
           data-testid="vulnerability-more-identifiers"
           class="gl-text-gray-500"
         >
-          <span>+</span>
-          <gl-sprintf :message="__('%{count} more')">
+          <gl-sprintf :message="__('+ %{count} more')">
             <template #count>
               {{ extraIdentifierCount(item.identifiers) }}
             </template>

ee/spec/frontend/security_dashboard/components/vulnerability_list_spec.js

@@ -11,6 +11,7 @@ import VulnerabilityList, {
 import FiltersProducedNoResults from 'ee/security_dashboard/components/empty_states/filters_produced_no_results.vue';
 import DashboardHasNoVulnerabilities from 'ee/security_dashboard/components/empty_states/dashboard_has_no_vulnerabilities.vue';
 import { generateVulnerabilities, vulnerabilities } from './mock_data';
+import { trimText } from 'helpers/text_helper';
 
 describe('Vulnerability list component', () => {
   useLocalStorageSpy();
@@ -217,10 +218,12 @@ describe('Vulnerability list component', () => {
 
       const firstIdentifiers = newVulnerabilities[0].identifiers;
       expect(identifiers.at(0).text()).toBe(firstIdentifiers[0].name);
-      expect(extraIdentifierCounts.at(0).text()).toContain(firstIdentifiers.length - 1);
+      expect(trimText(extraIdentifierCounts.at(0).text())).toContain(
+        `${firstIdentifiers.length - 1} more`,
+      );
 
       expect(identifiers.at(1).text()).toBe(newVulnerabilities[1].identifiers[0].name);
-      expect(extraIdentifierCounts.length).toBe(1);
+      expect(extraIdentifierCounts).toHaveLength(1);
     });
 
     it('should display the vulnerability report type', () => {