Can't select text from filter variables. Why?

Question

Django

{% blocktrans with text3 = page.text3|richtext %}
    {{ text3 }}
{% endblocktrans %}

.po:
#: templates/home/about_page.html:78
#, python-format
msgid ""
"\n"
"\n"
"\t\t%(text3)s\n"
"    "
msgstr ""