いろんなフォントで「back_burner」変換
Zen Old Minchoback_burner
Yusei Magicback_burner
M PLUS 1back_burner
Shippori Antiqueback_burner
Yuji Maiback_burner
Dela Gothic Oneback_burner
DotGothic16back_burner
Train Oneback_burner
Hira Minchoback_burner
Potta Oneback_burner
Reggae Oneback_burner
Stickback_burner
Zen Kurenaidoback_burner
Kosugi Maruback_burner
Rampart Oneback_burner
Hachi Maru Popback_burner
New Tegominback_burner
RocknRoll Oneback_burner
Kaisei Decolback_burner
「back_burner」をコピペできる装飾文字に変換（旧字体・丸囲みなど）
