Docs: add zh-CN entrypoint translations (#6300)

* Docs: add zh-CN entrypoint translations

* Docs: harden docs-i18n parsing

scripts/docs-i18n/glossary.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+)
+
+type GlossaryEntry struct {
+	Source string `json:"source"`
+	Target string `json:"target"`
+}
+
+func LoadGlossary(path string) ([]GlossaryEntry, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	var entries []GlossaryEntry
+	if err := json.Unmarshal(data, &entries); err != nil {
+		return nil, fmt.Errorf("glossary parse failed: %w", err)
+	}
+
+	return entries, nil
+}