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src/pipes/translate.pipe.ts

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+import { Pipe, PipeTransform } from '@angular/core';
+import { I18nService } from '../services/i18n.service';
+
+@Pipe({
+  name: 't',
+  standalone: true,
+  pure: false,
+})
+export class TranslatePipe implements PipeTransform {
+  constructor(private i18n: I18nService) {}
+  transform(key: string, paramsOrFallback?: any): string {
+    // If a string is passed as the second arg, treat it as a fallback text.
+    // Otherwise, assume it's a params object for interpolation.
+    const params = (paramsOrFallback && typeof paramsOrFallback === 'object') ? paramsOrFallback : undefined;
+    const fallback = (typeof paramsOrFallback === 'string') ? paramsOrFallback : undefined;
+    const val = this.i18n.t(key, params);
+    // When i18n returns the key unchanged, use the provided fallback if any
+    if (fallback && val === key) return fallback;
+    return val;
+  }
+}