The wiki uses the most basic English/Latin form of the language (romanization) when presenting general information, such as names and page titles. This is to keep things as simple as possible. However, the truer romanization will often use extra diacritical marks to impart more exact, flavorful information. For example, look at the difference between naive and naïve. Both are equally proper, but the second imparts more information and is truer to the language the word came from.
Languages on the wiki will have an infobox about the language. It will note when and how the proper romanization differs from the simple romanization. The box on this page illustrates this by using the naive/naïve distinction. The proper naïve appears in the header, while the simple naive appears below it, marked as a romanization.