True. Unfortunately, Duolingo was designed to consider capitalization to be unimportant. This has caused many problems for the Klingon course, but also for many other courses. Even in English there are some words that are always capitalized, like personal names, the pronoun I, the names of groups of people, etc. In German all nouns are capitalized. But Duolingo does not require that users learn to capitalize these. Do'Ha'.