split quotedprintable and utf8 converters

app/converter/utf8encoder.ts

@@ -0,0 +1,23 @@
+import {Converter} from "./converter";
+import {NativeLibraryWrapperService} from "../nativelibrarywrapper.service";
+
+export class UTF8Encoder implements Converter {
+    constructor(private nativeLibraryWrapperService:NativeLibraryWrapperService) {
+    }
+
+    getDisplayname():string {
+        return "Encode UTF-8";
+    }
+
+    getId():string {
+        return "encodeutf8";
+    }
+
+    convert(input:string):string {
+        try {
+            return this.nativeLibraryWrapperService.utf8.encode(input);
+        } catch (error) {
+            throw new Error("The input can not be encoded as UTF-8. May be corrupt?");
+        }
+    }
+}