Wiktionary
intertitle
n. (context cinematography English) A piece of static text inserted into the film to provide context or other information.
Wikipedia
Intertitle
In motion pictures, an intertitle (also known as a title card) is a piece of filmed, printed text edited into the midst of (i.e. inter-) the photographed action at various points. Intertitles used to convey character dialogue are referred to as "dialogue intertitles", and those used to provide related descriptive/narrative material are referred to as "expository intertitles".