Transliterate ASCII a-z and A-Z to their Unicode mathematical Fraktur equivalent. Eszett and umlaut aren't used because the Unicode specification defines these characters only as a mathematical symbol via `http://www.unicode.org/faq/ligature_digraph.html'. Via +saizai `https://plus.google.com/+saizai/posts/V7zxyRYg2EB': "π•Ώπ–π–Šπ–—π–Š π–Žπ–˜ 𝖓𝖔 π–˜π–šπ–ˆπ– π–™π–π–Žπ–“π–Œ π–†π–˜ π–‡π–”π–‘π–‰π–Žπ–“π–Œ π–Žπ–“ π•±π–—π–†π–π–™π–šπ–—.".