Computer systems, methods, and media for guaranteeing the quality of a language translation of content by using a computer network of human and/or machine translators and human reviewers of the original translation. The accuracy and quality of the original translation by a translator is ensured by a translation service provider computer system breaking the original translation into parts, and incorporating fabricated errors into a percentage of the parts while keeping the remaining parts unaltered. Incompetent reviewers are automatedly identified based on their ability to detect the system's fabricated errors. The system then performs an analysis on the remaining unaltered parts rated by the remaining competent reviewers to determine if the quality of the original translation meets a set standard. The translation service provider and the customer are not required to know: the target language; the accuracy of the human or machine translator; and/or, the accuracy of each translation reviewer.
