multi-character: 0|1
1 - Write multiple characters consecutively
0 - recognized as a character

lang: zh-cn | ko | ja | en | fr | de | ru | pt | es
Chinese, Japanese, Korean, English, French, German, Russian, Portuguese, Spanish

strokes:
Stroke data, separated by “a” character x, y coordinates. Separate each stroke with an “s” character.
Use HTML Canvas Coordinates (x, y are positive integers)
https://www.w3schools.com/graphics/canvas_coordinates.asp

For example:
Use 291a306a522a299as417a155a407a460as to represent “+” graphic strokes