We'll create fresh WordPress site with Custom Translation Files installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Let’s say, you have translated a plugin or theme and have a mo file ready. But the plugin author does not respond to your submission offer or you cannot contact the author for whatever reasons.
In this case, you may be able to upload the file in the location that the plugin uses within the plugin’s directory but this is not ideal because when it is updated, your translation file will be gone. You have to repeat doing it.
This plugin solves this problem by allowing you to upload the mo file and lets WordPress use it.
What you need are:
Set these in the setting page and the plugin will take care of the rest.
It’s simple and lightweight.