Dear students who are constantly marking this sentence as "Unnatural or has an error,"
As it is your first day learning Klingon, and you are coming from a language that puts the subject first and requires tense marking on almost all verbs, the word order and lack of tense will seem unnatural. That is not what the "sentence is unnatural" choice is for. There is not an error. The words are supposed to be in that order. Read the tips and notes or ask a question.
If you truly believe a sentence to be unnatural or erroneous, tell us why here in the comments. Maybe we'll agree with you if you can make a case. Otherwise we just delete your complaint as unsubstantiated.
I'm new to Klingon so apologies if this is a "Duh"? question. If we wanted to distinguish that Mara understood the "Klingon language" rather than "the Klingons", how would we achieve that? Would it be understood in context or would we have to specify the word for language by adding Hol such as "tlhIngan Hol yaj mara"? OR would we simply say, "tlhIngan yaj mara"?