Pass coreutils-l10n dir to theme patch script in CI

Author: sylvestre

.github/workflows/website.yml

@@ -68,7 +68,7 @@ jobs:
 
     - name: Patch mdbook theme with language selector
       run: |
-        uutils.github.io/scripts/patch-mdbook-theme.sh coreutils/docs
+        uutils.github.io/scripts/patch-mdbook-theme.sh coreutils/docs coreutils-l10n
 
     - name: Build Coreutils Docs
       run: |