いろんなフォントで「focal_length」変換
Zen Old Minchofocal_length
Yusei Magicfocal_length
M PLUS 1focal_length
Shippori Antiquefocal_length
Yuji Maifocal_length
Dela Gothic Onefocal_length
DotGothic16focal_length
Train Onefocal_length
Hira Minchofocal_length
Potta Onefocal_length
Reggae Onefocal_length
Stickfocal_length
Zen Kurenaidofocal_length
Kosugi Marufocal_length
Rampart Onefocal_length
Hachi Maru Popfocal_length
New Tegominfocal_length
RocknRoll Onefocal_length
Kaisei Decolfocal_length
「focal_length」をコピペできる装飾文字に変換（旧字体・丸囲みなど）
