1. A computer program product for customizing a textual display, the computer program product comprising: one or more non-transitory computer-readable storage media and program instructions stored on the one or more non-transitory computer-readable storage media, the program instructions comprising: authenticating an identify of a user; retrieving a user profile that corresponds to the identity of the user, wherein the user profile contains unique information relating at least one of the user's professional background, user's education level, or user's expertise, and the user profile contains unique information relating to the user's reading comprehension abilities; analyzing the unique information contained within the user profile to determine a textual content preference; determining that the textual content preference is that a scientific terminology is to be displayed in a predetermined language; receiving a content to be displayed; identifying a language that is used in the content to be displayed, wherein the language of the content is different than the predetermined language; analyzing the content by parsing a text contained within the content to identify any scientific terminology phrases contained within the text of the content; determining a definition for each of identified scientific terminology phrases contained within the text of the content; determining an equivalent phrase in the predetermined language for each of identified scientific terminology phrases contained within the text of the content; modifying the content by replacing each of identified scientific terminology phrases contained within the text of content with the equivalent phrases in the predetermined language; displaying the modified content; determining, by the computer, an engagement level of the user with the modified content, and updating, by the computer, the information relating to the content specific user engagement level contained within the user profile based on the determined engagement level; and wherein the displayed content contains both the predetermined language and the language of the content.