fix image template

Author: tobi-werner

content/templates/content/export/Image.tex

@@ -2,9 +2,9 @@
 {% autoescape off %}
 
 \textbf{Image}
-\Image{ {{content.description}} }{% templatetag openbrace %}{{content.imagecontent.image.path}}{% templatetag closebrace%}
+\Image{ {{content.description|tex_escape}} }{% templatetag openbrace %}{{content.imagecontent.image.path}}{% templatetag closebrace%}
 \newline
- {{content.description}}
+ {{content.description|tex_escape}}
 \newline
 
 {% endautoescape %}