WP_Multilingual is extension that brings WordPress multilingual support. With it's help you can publish more that in one language at a time.

Noted That:

To install correctly this wp-multilingual.zip.
Fisrt Download the wp-multilingual.zip to your computer
Extract/Open wp-multilingual.zip to Your Computer.
Then, Find readme.txt file inside wp-multilingual.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "wp-multilingual.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "wp-multilingual.zip" Downloaded plugin from your computer, Where you downloaded wp-multilingual.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "WP_Multilingual" folder is added on left sidemenu. Now, Click on "WP_Multilingual" folder.

Noted that: If you do not see "WP_Multilingual" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about WP_Multilingual Configurtions and Settings or How to work "WP_Multilingual" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "WP_Multilingual" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is WP_Multilingual
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
MySQL database issues You will need to check which character set your database is set to before you proceed. Almost 99% of hosting services that provide MySQL set the default language to Latin. Before you proceed you will need to change this to UTF-8. Not doing so will prevent your chosen character set from displaying and saving correctly. You can check your character set using PhpMyAdmin ( http://phpmyadmin.net ). If your database is set to UTF-8 then you can proceed, otherwise you will need to follow the step below. Take look to detailed installation article http://made.com.ua/multilingual/

Guide

MySQL database issues

You will need to check which character set your database is set to before you proceed. Almost 99% of hosting services that provide MySQL set the default language to Latin. Before you proceed you will need to change this to UTF-8. Not doing so will prevent your chosen character set from displaying and saving correctly. You can check your character set using PhpMyAdmin ( http://phpmyadmin.net ). If your database is set to UTF-8 then you can proceed, otherwise you will need to follow the step below.

Take look to detailed installation article http://made.com.ua/multilingual/

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Reffered: https://wordpress.org/