Language Fallback

Starting with WordPress 4.3, you can use languages such as “Deutsch (Sie)” (formal German) in your WordPress installation. But if the themes or plugins you are using do not have a
translation file for this language, WordPress would use the default language, usually English, instead. With the help of this plugin, you can set a fallback for your chosen language.
Every time a translation file is loaded, the plugin will then load the fallback if a translation for the originally chosen language was not found.

A list of all my plugins can be found on the WordPress Plugin page on my blog kau-boys.com.