| Subject | English | Bulgarian |
| comp., MS | user interface language | език за потребителски интерфейс (The language in which all software (including the operating system) displays its menus, help files, error messages, and dialog boxes) |
| comp., MS | user-preferred interface language | потребителски език на интерфейса (A language selected by the user for viewing menus, dialog boxes, messages, and Help files. If none is selected, the system-preferred language is displayed) |