fix: Add language module to some jinja file

Author: Xiaokang2022

src/mkdocstrings_handlers/python/templates/material/_base/children.html.jinja

@@ -19,6 +19,9 @@ Context:
     {{ log.debug("Rendering children of " + obj.path) }}
   {% endblock logs %}
 
+  {% import "language.html.jinja" as lang with context %}
+  {#- Language module providing the `t` translation method. -#}
+
   <div class="doc doc-children">
 
     {% if root_members %}

src/mkdocstrings_handlers/python/templates/material/_base/class.html.jinja

@@ -17,6 +17,9 @@ Context:
   {{ log.debug("Rendering " + class.path) }}
 {% endblock logs %}
 
+{% import "language.html.jinja" as lang with context %}
+{#- Language module providing the `t` translation method. -#}
+
 <div class="doc doc-object doc-class">
   {% with obj = class, html_id = class.path, all_members = class.all_members %}