SONAR-11982 Rename Standards facet group to Security Category

sonar-core/src/main/resources/org/sonar/l10n/core.properties

@@ -740,7 +740,7 @@ issues.facet.issues=Issue Key
 issues.facet.mode=Display Mode
 issues.facet.mode.count=Issues
 issues.facet.mode.effort=Effort
-issues.facet.standards=Standard
+issues.facet.standards=Security Category
 issues.facet.owaspTop10=OWASP Top 10
 issues.facet.sansTop25=SANS Top 25
 issues.facet.sonarsourceSecurity=SonarSource