_klipper3d: Specify mkdocs language config options

Signed-off-by: Yifei Ding <yifeiding@protonmail.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

docs/_klipper3d/mkdocs.yml

@@ -1,5 +1,8 @@
 # Main configuration file for mkdocs generation of klipper3d.org website
 
+# Note that the build-translations.sh script expects a certain file
+# layout.  See that script and the README file for more details.
+
 # Site and directory configuration
 site_name: Klipper documentation
 repo_url: https://github.com/Klipper3d/klipper
@@ -19,7 +22,8 @@ markdown_extensions:
   - mdx_truly_sane_lists
   - mdx_breakless_lists
 plugins:
-  search: {}
+  search:
+    lang: en
   mkdocs-simple-hooks:
     hooks:
       on_page_markdown: "docs._klipper3d.mkdocs_hooks:transform"
@@ -58,6 +62,7 @@ theme:
       - search.suggest
       - search.highlight
       - search.share
+  language: en
 extra_css:
   - _klipper3d/css/extra.css
 
@@ -71,6 +76,7 @@ extra:
   alternate:
     - name: English
       link: /
+      lang: en
     # Alternate language links automatically added here
 
 # Navigation hierarchy (this should mimic the layout of Overview.md)