My problem is that the german ü, ä, ö in HTML are displayed as not known sign .
You can write ü as "&uuml ;" ä as "&auml ;" and so one.
But is it not possible to replace ü with "&uuml ;" in a typescript method. The result will be "&uuml ;".

This is my method in typescript which replace ü with "&uuml ;"

```
public stringHelper(textUml: string): string {
    textUml = textUml.replace("ü", "&uuml;");
    debugger;
    return textUml;
}

<button class="btn btn-success" (click)="addKeySkill()">{{stringHelper("Hinzufügen")}}</button>

```

Instead of displaying "Hinzufügen" its display "Hinzuf&uuml ;gen".

[![enter image description here](https://i.stack.imgur.com/Gqhvp.png)](https://i.stack.imgur.com/Gqhvp.png)