I have data "like" this:
$scope.persons = {
        "ID123": {
            name_de: "Andre",
            name_en: "Anrew",
            age: 30,
            description: "He is the father of xyz and . . .",
             . . .
        },
        "IDabc": {
            name_de: "Markus",
            name_en: "Mark",
            age: 20,
             . . .
        },
        "IDxyz": {
            name_de: "Isaak",
            name_en: "Isaac",
            age: 23,
             . . .
        }
    . . .
}
and i have an input/ng-repeat:
<input ng-model="query" placeholder="Suche . . .">
<ul>
    <li ng-repeat="p in persons | orderBy:'name_de' | filter:query"> Some output here . . . </li>
</ul>
Now is the question how can i order and filter this?
It worked with an Array of persons, but i need the "ID's" so the object is necessary!?
I am looking also for a way to filter the object by N-properties e.g for name_de AND name_en (so it will show ID123 if i search for Andre and also if i search for Andrew) BUT ignoring the text of "description" (first i had the problem that the filter checks ALL properties)
You can use toArrayfilter module more info please see here :http://ngmodules.org/modules/angular-toArrayFilter
and there sample demo for your solution http://jsbin.com/nimoxa/1/edit JS:
angular.module('angular-toArrayFilter', [])
.filter('toArray', function () {
  return function (obj, addKey) {
    if (!(obj instanceof Object)) {
      return obj;
    }
    if ( addKey === false ) {
      return Object.values(obj);
    } else {
      return Object.keys(obj).map(function (key) {
        return Object.defineProperty(obj[key], '$key', { enumerable: false, value: key});
      });
    }
  };
});
var app = angular.module('app', ['angular-toArrayFilter']);
app.controller('firstCtrl', function($scope){
  $scope.persons = {
    "IDabc": {
            name_de: "Markus",
            name_en: "Mark",
            age: 20,
        },
        "ID123": {
            name_de: "Andre",
            name_en: "Anrew",
            age: 30,
            description: "He is the father of xyz and . . .",
        },
        "IDxyz": {
            name_de: "Isaak",
            name_en: "Isaac",
            age: 23,
        }   
};
});
html:
body ng-app="app">
  <div ng-controller="firstCtrl">
<input ng-model="query" placeholder="Suche . . .">
<ul>
    <li ng-repeat="p in persons | toArray | orderBy:'age' | filter:query"> {{p.name_de}} -> {{p.name_en}} </li>
</ul>
      </div>
</body>
                        To answer your question on
It worked with an Array of persons, but i need the "ID's" so the object is necessary!?
can you include ID as a property of your person objects so that they will look like this?
$scope.persons = [
    { id: "ID123",
      name_de: "Andre",
      name_en: "Anrew",
      age: 30,
      description: "He is the father of xyz and . . .",
      . . .
    },
    { id: "IDabc",
      name_de: "Markus",
      name_en: "Mark",
      age: 20,
    },
         . . .
];
To search by name_de AND name_en (or any other properties for the matter), you can try writing your custom filter. It's fairly easy.
var app = angular.module("YourApp");
app.filter('MyCustomFilter', function(){
    return function(objects, criteria){
        if(!criteria)            
            return objects;
        var filterResult = new Array();
        for(var index in objects)
            if(objects[index].name_de.indexOf(criteria) != -1 || objects[index].name_en.indexOf(criteria) != -1)
                filterResult.push(objects[index]);
        return filterResult;
    }
});
Your HTML will look like this:
<input type="text" data-ng-model="personFilter" />
<div data-ng-repeat="person in persons | MyCustomFilter:personFilter"> ... </div>
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