diff --git a/src/app/directives/translate.directive.ts b/src/app/directives/translate.directive.ts
index 10d5f99..8197ac5 100644
--- a/src/app/directives/translate.directive.ts
+++ b/src/app/directives/translate.directive.ts
@@ -7,12 +7,12 @@ import { TranslateService } from '../services/translate.service';
 export class TranslateDirective implements AfterViewInit {
 
   @Input() translate: string;
-  @Input() substitutions: string | string[]; // ToDo
+  @Input() substitutions: string | string[];
 
   constructor(private translateService: TranslateService, private element: ElementRef) { }
 
   ngAfterViewInit() {
     const key = this.translate.length ? this.translate : this.element.nativeElement.innerHTML.trim();
-    this.element.nativeElement.innerHTML = this.translateService.get(key);
+    this.element.nativeElement.innerHTML = this.translateService.get(key, this.substitutions);
   }
 }
diff --git a/src/app/pipes/translate.pipe.ts b/src/app/pipes/translate.pipe.ts
index f245168..351b23e 100644
--- a/src/app/pipes/translate.pipe.ts
+++ b/src/app/pipes/translate.pipe.ts
@@ -8,7 +8,7 @@ export class TranslatePipe implements PipeTransform {
   
   constructor(private translateService: TranslateService) { }
   
-  transform(key: string): string {
-    return this.translateService.get(key);
+  transform(key: string, substitutions?: string | string[]): string {
+    return this.translateService.get(key, substitutions);
   }
 }
diff --git a/src/app/services/translate.service.ts b/src/app/services/translate.service.ts
index 61440e5..34ffbfa 100644
--- a/src/app/services/translate.service.ts
+++ b/src/app/services/translate.service.ts
@@ -46,7 +46,12 @@ export class TranslateService {
   }
 
   get(key: string, substitutions?: string | string[]): string {
-    return this.app.isWebExtension ? browser.i18n.getMessage(key, substitutions) : this.translate(key, substitutions);
+    if (this.app.isWebExtension) {
+      const translation = browser.i18n.getMessage(key, substitutions);
+      return translation.length ? translation : key;
+    } else {
+      return this.translate(key, substitutions);
+    }
   }
 
   private translate(key: string, substitutions?: string | string[]): string {