Play 2.8.2 I18N @Messages not working anymore in templates

I’m trying to get my 2.6 app running in 2.8. I have a dozen of view helpers for form input since 2.3. Sadly in 2.8 they don’t compile anymore with the message: An implicit MessagesProvider instance was not found. Please see https://www.playframework.com/documentation/latest/ScalaForms#Passing-MessagesProvider-to-Form-Helpers

Scrolling through the documentation it seems that you now have to provide a MessageProvider in the controller But this code is not run through conrollers. They are just view helpers.

How can i get it running?

@import scala.collection.immutable.Map

@(field: Field, label: String = "CHANGEME", placeholder: String = null, help: String = "", spec: Any = null, disabled: Boolean = false, required: Boolean = false, attr: Map[Symbol, _] = Map())

    @import helper.renderAttr

    <div class="form-group @if(field.hasErrors) {has-error}">
        <label class="col-sm-4 col-md-2 control-label@if(required) { required}" for="@field.id">@Messages(label)</label>
        <div class="col-sm-8 col-md-10">
            <div class="input-group">
                <input
                    @renderAttr(Map(
                        'type -> "text"
                    ) ++ attr ++ Map(
                        'class -> ("form-control" + attr.get('class).map(" " + _).getOrElse("")),
                        'id -> field.id,
                        'name -> field.name,
                        'value -> field.value.getOrElse(""),
                        'placeholder -> Messages(placeholder),
                        'disabled -> disabled,
                        'required -> required
                    ))
                >
                <span class="input-group-btn">
                    <button class="btn btn-default" onclick="assistent(@field.id)" type="button"><i class="fa fa-magic"></i></button>
                </span>
            </div>
            @if("" != help) {
                <span class="help-block">@help</span>
            }
            @if(field.hasErrors) {
                <span class="help-block">@{
                    field.error.map { error => Messages(error.message) }
                }</span>
            }
        </div>
    </div>