diff --git a/.env.sample b/.env.sample
index e99fc96..de93ed0 100644
--- a/.env.sample
+++ b/.env.sample
@@ -10,6 +10,7 @@ MEDIAWIKI_SITENAMESPACE="Example_Wiki"
 MEDIAWIKI_EMAIL_CONTACT="info@wiki.example.com"
 MEDIAWIKI_EMAIL_FROM="wiki@wiki.example.com"
 MEDIAWIKI_LOGO_FILE='$wgResourceBasePath/resources/assets/wiki.png'
+MEDIAWIKI_LANGUAGE="en"
 
 MEDIAWIKI_IS_PRIVATE=1
 
diff --git a/LocalSettings.php.tmpl b/LocalSettings.php.tmpl
index 41a2833..62e500e 100644
--- a/LocalSettings.php.tmpl
+++ b/LocalSettings.php.tmpl
@@ -84,7 +84,7 @@ $wgShellLocale = "C.UTF-8";
 #$wgCacheDirectory = "$IP/cache";
 
 # Site language code, should be one of the list in ./languages/data/Names.php
-$wgLanguageCode = "en";
+$wgLanguageCode = "{{ env "MEDIAWIKI_LANGUAGE" }}";
 
 $wgSecretKey = rtrim(file_get_contents('/run/secrets/mediawiki_secret_key'));
 
diff --git a/abra.sh b/abra.sh
index 52c49d9..baa89a5 100644
--- a/abra.sh
+++ b/abra.sh
@@ -1,4 +1,4 @@
-export LOCAL_SETTINGS_CONF_VERSION=v20
+export LOCAL_SETTINGS_CONF_VERSION=v21
 export HTACCESS_CONF_VERSION=v1
 export ENTRYPOINT_CONF_VERSION=v19
 export COMPOSER_LOCAL_CONF_VERSION=v5