Edit language files within OCMS

I am currently setting up a multilingual site with the multisite feature. I have created corresponding language files in my theme for this purpose. So far so good.

How can I edit these files in OCMS? I am used to the fact that all files in the theme can be edited in the editor. This allows me to edit the website online in one central location. Only the language files are not displayed there. I now have to start an FTP client and another offline-editor in order to work on the website.