fill method

Does an sprintf on the text with the params. This is implemented with the sprintf package: https://pub.flutter-io.cn/packages/sprintf

Possible format values:

• %s - String
• %b - Binary number
• %c - Character according to the ASCII value of c
• %d - Signed decimal number (negative, zero or positive)
• %u - Unsigned decimal number (equal to or greater than zero)
• %f - Floating-point number
• %e - Scientific notation using a lowercase, like 1.2e+2
• %E - Scientific notation using a uppercase, like 1.2E+2
• %g - shorter of %e and %f
• %G - shorter of %E and %f
• %o - Octal number
• %X - Hexadecimal number, uppercase letters
• %x - Hexadecimal number, lowercase letters

Additional format values may be placed between the % and the letter. If multiple of these are used, they must be in the same order as below.

• + - Forces both + and - in front of numbers. By default, only negative numbers are marked
• ' - Specifies the padding char. Space is the default. Used together with the width specifier: %'x20s uses "x" as padding
• - - Left-justifies the value
• [0-9] - Specifies the minimum width held of to the variable value
• .[0-9] - Specifies the number of decimal digits or maximum string length. Example: %.2f:

This function is visible only from the i18_exception_core package. The i18_exception package uses a different function with the same name.