Emotions are not only biological stimulii but a culturally conditioned experience. When people say a culture has words for certain emotions that don't exist in other cultures - it means a person's culture, including language, shapes their experience of the world and themselves.

As one lives with various cultures and languages, it becomes clear that people experience and express the world very differently. Some experiences are universal, others are cultural, and they are all uniquely personal. There's a limit to what can be translated. Outside of that limitation is a whole unknown expanse of "dark matter" that are lost in translation, no matter how many words or longer sentences you use. For deeply cultural or personal experiences, some things are not only impossible to translate, they are impossible to communicate.