Theme features Section Read more Button

Hi
I’m working on MedPlus, so now i want to ad the translation for read more button and if i type like:
<a class="button" href="zahnbehandlungen">[:de]Mehr lesen[:en]Read More</a>
it crash my site so the frontpage ist messy:
The full code ist hier:

[column_content type="one_fourth"]<i class="fas fa-tooth" style="font-size: 50px; margin-bottom: 20px;"></i>
<h3>Zahnbehandlungen</h3>
Nulla consequat massa quis enim.Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu.In enim justo, rhoncus ut, imperdiet a, venenatis vitae, justo. Nullam dictum felis.

<a class="button" href="zahnbehandlungen">[:de]Mehr lesen[:en]Read More</a>

[/column_content]

and when i remove [:de]Mehr lesen[:en]Read More and leave just Read More it works.
can please somebody help me?
thank you