German is a West Germanic language, related to and classified alongside English and Dutch. With an estimated 90 _ 98 million native speakers, German is one of the world's major languages and is the most widely-spoken first language in the European Union. wikipedia.org

Proofreading (also proof-reading) is the reading of a galley proof or computer monitor to detect and correct production-errors of text or art. Proofreaders are expected to be consistently accurate by default because they occupy the last stage of typographic production before publication. wikipedia.org

A ghostwriter is a professional writer who is paid to write books, articles, stories, reports, or other texts that are officially credited to another person. wikipedia.org