いろんなフォントで「form_letter」変換
Zen Old Minchoform_letter
Yusei Magicform_letter
M PLUS 1form_letter
Shippori Antiqueform_letter
Yuji Maiform_letter
Dela Gothic Oneform_letter
DotGothic16form_letter
Train Oneform_letter
Hira Minchoform_letter
Potta Oneform_letter
Reggae Oneform_letter
Stickform_letter
Zen Kurenaidoform_letter
Kosugi Maruform_letter
Rampart Oneform_letter
Hachi Maru Popform_letter
New Tegominform_letter
RocknRoll Oneform_letter
Kaisei Decolform_letter
「form_letter」をコピペできる装飾文字に変換（旧字体・丸囲みなど）
