By pressing Add Language navigates you to a new pop up window as shown in the example below where you select a language that you want to appear in your event creation where there is a step of translation to a specific language.
Language creation fields
|The language to which the descriptions will be translated to.|
|A list of references used for language integrations if your system has unique identifiers for the same languages.|
If you did all the steps correctly the language that you added should be created in the Settings → Languages and shown as in an example. After adding you can Remove the selected language from the list but not from the system itself.