Alright guys I fixed it using Umbraco Dictionary :)

If you don't know what it is, here's how I did it:

Solution:

1) I use @Umbraco.GetDictionartyValue in my foreach as you can see here:

 foreach (var time in times)
                {
                    <ul itemprop="dayOfWeek" datetime="@time.Weekday">
                        <li>@Umbraco.GetDictionaryValue("Weekday-Property-" +  @time.Weekday)</li>

                        @if (time.IsScheduled)
                    {
                            <li itemprop="opens">@time.Open</li>
                            <li itemprop="closes">@time.Close</li>
                        }
                        else
                        {
                            <li itemprop="opens">Lukket</li>
                            <li itemprop="closes">Lukket</li>
                        }
                    </ul>
                }

2) You can rename Weekday-Property- to anything you'd like, such as Green-Potato-Day-.

3) I then entered Umbraco Backoffice -> Settings -> Dictionary and choosed create.

4) For the name I entered Weekday-Property-Monday because in my Foreach I entitled the dictionaryitem Weekday-Property- followed by the @time.Weekday which is Monday, Thuesday etc. etc..

5) My newly created Dictionary item is entitled Weekday-Property-Monday with the value of "Mandag".

I hope it helps :)