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They just have to be translated : just define the new names in the translation files.

it it the lang.xls file.
You can get it on download page.
Place it in /tool/i18n/nls.
Update the items or create new lines.
Use "save as" (mandatory to do it once).
Then click "generate" button.
This will generate all the required lang.js files.

NB : it your server is not running on winwdows, just do it locally on your workstation and then copy /tool/i18n/nls structure generate to the server.