I added the keyword "jem'hadar" on February 14 2020 to the Star Trek: Deep Space Nine episode "One LIttle Ship": https://www.imdb.com/title/tt0708572/keywords . My submission was approved by the IMDb staff: https://contribute.imdb.com/contribution/200214-200957-737000/?ref_=ra_sub_wa . The keyword has still not appeared on the database. Note: the embedded apostrophe is correct; see the reference to the Memory Alpha site in the submission approval. I thought the embedded apostrophe was the problem, but there are plenty of keywords that have it--search for the keyword "don't" and there are several dozen hits.