strip tags in title

theme/templates/page.html

 {% extends "base.html" %}
 
-{% block title %}{{ render.softbreak_span(page.title) }}{% endblock %}
+{% block title %}{{ render.softbreak_span(page.title)|striptags }}{% endblock %}
 
 {% block extra_head %}
 	{%- for translation in page.translations -%}

theme/templates/tag.html

 {% extends "base.html" %}
 {% block title -%}
 	{%- call(tagtitle, tagcolor, tagurl, tagpage, tagpages) get.tag_by_name(tag, l) -%}
-		{{ t[l].title_prefix }}{{ t[l].sitename }}{{ t[l].title_suffix }} - {{ render.softbreak_span(tagtitle) }}
+		{{ t[l].title_prefix }}{{ t[l].sitename }}{{ t[l].title_suffix }} - {{ render.softbreak_span(tagtitle)|striptags }}
 	{%- endcall -%}
 {%- endblock -%}