Fix typos

_includes/footer.html

@@ -1,3 +1,10 @@
+{%- comment -%}
+  Find the page language.
+{%- endcomment -%}
+{%- assign page_lang = 'en' -%}
+{%- if page.lang -%}
+  {%- assign page_lang = page.lang -%}
+{%- endif -%}
 {%- comment -%}
   Get the changelog page:
   - Use the `custom_changelog` value when existing. Also supports the legacy `changelog` frontmatter variable for now.
@@ -8,7 +15,7 @@
 {%- elsif page.changelog -%}
   {%- assign changelog_url = page.changelog -%}
 {%- elsif page.ref -%}
-  {%- assign changelog_url = page.url | append: "changelog/" -%}
+  {%- assign changelog_url = page.ref | append: "changelog/" -%}
 {%- else -%}
   {%- assign changelog_url = page.url | append: "changelog/" -%}
 {%- endif -%}
@@ -136,13 +143,6 @@
   Most pages use this page footer.
 {%- endcomment -%}
 {%- else -%}
-  {%- comment -%}
-    Find the page language.
-  {%- endcomment -%}
-  {%- assign page_lang = 'en' -%}
-  {%- if page.lang -%}
-    {%- assign page_lang = page.lang -%}
-  {%- endif -%}
   {%- comment -%}
     Convert dates into integers to compare them later.
   {%- endcomment -%}