Diacritics I m not exactly sure about it I just know when my friend made some Japanese pages and used the fansubber styled transliteration he was told to use a more scholarly version If the word has common English usage that came from other than direct Arabic in the case of mosque transliteration then the common word should be used For like Mosque should have any diacrtics since it s an English word whereas Masjid should well if it had any it should A good guide I belive is Britannica it uses diacritics for certain words and we can follow their basic system Scholarly writing uses it as well if you read Fazlur Rahman he will use diacritics but more pedestrian works won t I don t know of any policy but to make an article a featured article it should have it There are definitely sticky cases like Muhammad really deserves a dot under the H but that s less common than macron So I m not fully sure but we should have some system there might be something about it in Arabic translation