Language sync and add back some contents (#575)

* Force syncing contents to Russian documents

* Add NFT note to front page

* Update Histories

* Update command usage

docs/ru/document/command.md

@@ -103,6 +103,59 @@ xray api <command> [arguments]
         rmo           Remove outbounds
 ```
 
+### xray convert
+
+Convert config to protobuf, or convert typedMessage to JSON
+
+usage:
+
+```
+xray convert <command> [arguments]
+
+The commands are:
+
+        pb           Convert multiple json configs to protobuf
+        json         Convert typedMessage to json
+```
+
+Sub-command `pb`
+```bash
+# Usage: xray convert pb [-debug] [-type] [json file] [json file] ...
+
+# mix three config files to mix.pb
+xray convert pb c1.json c2.json c3.json > mix.pb
+
+# Use -debug option to view the content of mix.pb
+xray convert pb -debug mix.pb
+
+# Start Xray-core with mix.pb
+xray -c mix.pb
+
+# Detailed usage
+xray help convert pb
+```
+
+Sub-command JSON
+```bash
+# Usage: xray convert json [-type] [stdin:] [typedMessage file]
+
+tmsg='{
+  "type": "xray.proxy.shadowsocks.Account",
+  "value": "CgMxMTEQBg=="
+}'
+
+echo ${tmsg} | xray convert json stdin:
+
+# Outputs from above:
+'{
+  "cipherType": "AES_256_GCM",
+  "password": "111"
+}'
+
+# Detailed usage
+xray help convert json
+```
+
 ### xray tls
 
 Инструменты для работы с TLS.