Clean up.

user/plugins/m3-p2/pages/README.md

 > Looks like useless empty files in here!
 
-We use them, though! See `m3-p2.php`.
\ No newline at end of file
+We do use them, though! See `m3-p2.php`.
+They're a convenient way of leveraging Grav's page system
+to make our custom pages.
\ No newline at end of file

user/themes/textbook/templates/language-columns.html.twig

-
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-
-{# DEPRECATED -- see polyglot-columns #}
-
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-{% extends 'partials/base.html.twig' %}
-
-{% block stylesheets %}
-    {% do assets.addCss('theme://css/columns.css') %}
-    {{ parent() }}
-{% endblock %}
-
-{% block javascripts %}
-    {% do assets.addJs('theme://js/syncscroll.js', {group:'bottom'}) %}
-    {{ parent() }}
-{% endblock %}
-
-
-{% block body %}
-
-    <div class="claude-columns">
-    {% for column in page | translations %}
-    {#{% for column in language_selector.translated_pages %}#}
-        <section id="{{ macro.pageLinkName(column.menu) }}" class="claude-column syncscroll" name="language">
-            {{ column.content|raw }}
-            {#{% include 'partials/contributions-incentive.html.twig' with {page: column} %}#}
-        </section>
-    {% endfor %}
-    </div>
-
-    {#{{ page.content|raw }}#}
-
-{% endblock %}

user/themes/textbook/templates/polyglot-columns.html.twig

 {% extends 'partials/base.html.twig' %}
 
+
 {# `page` is irrelevant here #}
 {# use `target_page`, injected by m3-p2 plugin #}
 
+
 {% block stylesheets %}
     {% do assets.addCss('theme://css/columns.css') %}
     {{ parent() }}
 {% endblock %}
 
+
 {% block javascripts %}
     {% do assets.addJs('theme://js/syncscroll.js', {group:'bottom'}) %}
     {{ parent() }}
@@ -15,18 +18,17 @@
 
 
 {% block body %}
-
     <div class="claude-columns">
     {% for column in target_page | translations %}
-        <section id="{{ macro.pageLinkName(column.menu) }}" class="claude-column syncscroll" name="language">
+        <section id="{{ column.slug }}" class="claude-column syncscroll" name="language">
             {{ column.content | raw }}
             {#{% include 'partials/contributions-incentive.html.twig' with {page: column} %}#}
         </section>
     {% endfor %}
     </div>
-
 {% endblock %}
 
+
 {# Disable the language selector. #}
 {% block header_language_selection %}{% endblock %}
 {# … disabling the whole section instead is semantically correct but it offsets the navigation. TBD #}