您好我需要在Angular 5中使用i18n作为以下标签。
<select name="colCaseType" type="string" [(ngModel)]="colCaseType" #select4>
<option *ngFor="let level of caseType" [ngValue]="level.caseStatus" i18n>
{{level.caseStatus | translate}}</option>
</select>
ts
public caseType: Array<Object> = [
{caseStatus: 'OPEN'},
{caseStatus: 'CLOSED'},
{caseStatus: 'RISK ACCEPTED'},
{caseStatus: 'ALL'}
];
如何实现国际化?