Makes an index of English Wiktionary entry names for each language. Requires the decompressed pages-articles.xml dump file and a TSV file (name_to_code.txt) in the format (<name> '\t' <code> '\n')+ where <name> is the Wiktionary language name (used in the language header) and <code> is the Wiktionary language code. Creates an entries directory in the current working directory with a <code>.txt file for each language listing all the entry names for that language, sorted case-insensitively.