界面语言切换功能，修复nav异常

templates/main.html

@@ -1,5 +1,5 @@
 {% set no_path_section = true %}
-{% set page_name = "domain_main" %}
+{% set page_name = "homepage" %}
 {% extends "layout/basic.html" %}
 {% import "components/contest.html" as contest with context %}
 {% block content %}

templates/partials/footer.html

@@ -54,7 +54,7 @@
             <span><span class="icon icon-global"></span> Language <span class="icon icon-expand_less"></span></span>
             <ol class="dropdown-target menu" id="menu-footer-lang">
             {% for item in model.builtin.VIEW_LANGS %}
-              <li class="menu__item"><a class="menu__link" href="/lang/{{ item.code }}">{{ item.name }}</a></li>
+              <li class="menu__item"><a class="menu__link" href="/language/{{ item.code }}">{{ item.name }}</a></li>
             {% endfor %}
             </ol>
           </li>