Outputs from a graphical user interface of a target computer program are captured during actual use of the target computer program. The captured outputs are processed to recognize strings and associate those strings with content derived from the outputs. The recognized strings and associated content are stored as context data. A translation editing tool accesses the context data and message data of the target computer program. The translation editing tool presents the message data through a graphical user interface to a user. In response to selected text from the message data, the context data are accessed to retrieve content associated with a recognized string that matches the selected text. The retrieved content is presented in the graphical user interface of the translation editing tool to provide contextual information to inform how to translate a message. Text input from the translator can be stored in the message data.