Preserve query string when switching language

The language switcher captured `request.path` for the current page,
which strips the query string. Switching language on a page like
/orchard/get-a-pod?pod=home redirected to /orchard/get-a-pod
without the pod parameter, breaking the destination route.

Use request.full_path so the query string is preserved across the
language switch.

Author: stultus

app/templates/base/base.html

@@ -93,7 +93,7 @@
             <ul id="lang-menu" class="lang-menu hidden" role="menu">
               {% for code, name in available_languages.items() %}
               <li role="menuitem">
-                <a href="{{url_for('settings.set_language', lang=code, current_page=request.path)}}"
+                <a href="{{url_for('settings.set_language', lang=code, current_page=request.full_path)}}"
                    {% if code == current_locale %}aria-current="true" class="active"{% endif %}>
                   {{ name }}
                 </a>