Just a quick note to help people who might be confused: If you’d like to write your report/thesis etc in Bahasa Malaysia (Standard Malay) (ISO-639 zsm), the correct language option to pass to babel is bahasam:

\usepackage[bahasam]{babel}

The babel option bahasa is actually a synonym for bahasai and loads Bahasa Indonesia (ISO-639 ind).

(For the linguistically minded, both zsm Standard Malay and ind Bahasa Indonesian, as well as many other languages, are members of the Malay macrolanguage (ISO-639 msa).

In addition, if you’d like to change a L^aT_eX string when babel is loaded, you’ll have to use the \addto\captionsXXX method. For example, to re-define figure captions to be “Rajah 1” instead of “Gambar 1”, you’ need to write

\addto\captionsbahasam{
  \renewcommand{\figurename}{Rajah}
}