POEditor

This plugin will let you manage your POEditor translations directly from WordPress via the POEditor API.
It will fetch all your projects from POEditor.com, based on your API KEY, and it will scan your /wp-content/ folder for gettext language files (.po and .pot). After this, you can assign files from your WordPress themes or plugins to your POEditor language files and you can import, export or sync your files with the POEditor translations.
You can find step by step instructions on how to use the POEditor plugin in this <a href="http://blog.poeditor.com/how-to-translate-wordpress-themes-and-plugins-using-the-poeditor-localization-plugin/" rel="nofollow ugc">localization guide</a>.
If you want to contribute to the localization of this plugin, please go to the <a href="https://poeditor.com/join/project/90c87a6885fac137e7810f31a1a5296f" rel="nofollow ugc">plugin’s translation page</a> and join the translation effort.
You can also contribute to plugin’s development on <a href="https://github.com/POEditor/poeditor_wp_plugin" rel="nofollow ugc">GitHub</a>.

This plugin will let you manage your POEditor translations directly from Wordpress via the POEditor API.

POEditor vs Automatic Multilingual Translation by Autoglot