Break line in input placeholder

Question

I've put a contact form within a modal.

However, when entering message in the message-part the text won't break line afte a while but instead go on forever to the right. This makes it hard for the writer of the message to see all that is written before submitting. I need help changing this. It's the "Meddelande" (means message) part that needs this fix only.

Here is a print screen, (the text is in swedish but it illustrates my point). messagebox

Here is my code and would love to get some help. Please ask if I'm not clear enough as I might have missed some important information :)

 <div class="modal fade" id="myModal" role="dialog">
        <div class="modal-dialog">

            <!-- Modal content-->
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal">&times;</button>
                    <h4><span class="glyphicon glyphicon-lock"></span> Kontakt</h4>
                </div>
                <div class="modal-body">
                    <form role="form">
                        <div class="form-group">
                            <label for="TelNummer"><span class="glyphicon glyphicon-earphone"></span> Telefonnummer</label>
                            <input type="number" class="form-control" id="TelNummer" placeholder="Ange telefonnummer">
                        </div>
                        <div class="form-group">
                            <label for="EMail"><span class="glyphicon glyphicon-envelope"></span> Email</label>
                            <input type="text" class="form-control" id="EMail" placeholder="Ange email">
                        </div>
                        <div class="form-group">
                            <label for="Meddelande"><span class="glyphicon glyphicon-pencil"></span> Meddelande</label>
                            <input type="text" class="form-control" style="height:50px" id="Meddelande" placeholder="Ange meddelande">
                        </div>
                        <button type="submit" class="btn btn-block" onclick="SkickaMail()">
                            Skicka
                            <span class="glyphicon glyphicon-ok"></span>
                        </button>
                    </form>
                </div>



                <div class="modal-footer">
                    <button type="submit" class="btn btn-danger btn-default pull-left" data-dismiss="modal">
                        <span class="glyphicon glyphicon-remove"></span> Avbryt
                    </button>
                    @*<p>Need <a href="#">help?</a></p>*@
                </div>
            </div>
        </div>
    </div>