The invention relates to a method for replacing subtitle text with occasional word or idiom translations. In the method an initial language skill is determined. A content object is selected for presentation. A content vocabulary associated with the content object is determined. The content vocabulary is reduced based on the initial language skill to produce a target vocabulary. The presentation of said content object is started in the electronic device. The presence of a word in the content object is detected. The translation of the word is displayed on a display of the electronic device, if the word belongs to the target vocabulary.