1. A method comprising, by one or more computing devices: accessing, by one or more of the computing devices, one or more translations for each text string of a plurality of text strings; determining, by one or more of the computing devices, a priority value for each text string of the plurality of text strings, wherein the priority value for the text string is based on one or more reliability-values of the one or more translations for the text string; selecting, by one or more of the computing devices, a particular text string from the plurality of text strings based on its priority value; and sending, to a client system, instructions configured to present a translation prompt comprising the particular text string.