reverse language in footer variable to be omitted instead of explicit

_includes/default_footer.njk

@@ -1,6 +1,6 @@
 <div class="footer-flex">
     <div class="footer-left">
-        {% if show_lang_in_footer %}
+        {% if not dont_show_lang_in_footer %}
             {% include "lang-available.njk" %}
         {% endif %}
     </div>

_layouts/guestbook.njk

@@ -1,6 +1,3 @@
----
-show_lang_in_footer: true
----
 {% extends "_layouts/base.njk" %}
 
 {% block content %}

_layouts/home.njk

@@ -4,6 +4,7 @@ lastfm: true
 flight: 
     img: "/img/Witch-on-broom.gif"
     url: "https://www.youtube.com/embed/w1dXpAJ1qfA"
+dont_show_lang_in_footer: true
 ---
 {% extends "_layouts/base.njk" %}
 

_layouts/post.njk

@@ -1,7 +1,6 @@
 ---
 # TODO: finish post page
 tags: post
-show_lang_in_footer: true
 ---
 {% extends "_layouts/base.njk" %}
 {% block content %}