How to fix the ads dates that are not translated?

Issue

Ads' dates are not translated in the selected language.

Solution

This means that your language locale is not installed on your server.

You have to fix the issue by installing the right locale in your server.
Example: If your language locale is de_DE you have to make sure that the de_DE locale are installed on your server.

You can check if the selected language locale is installed on your server (with the command line below):

locale -a