Translates Unicode code points in each input string.
a single character string providing code points to be translated
a single character string giving translated code points
str and with respect to each code point
replacement consist of a different number
of code points, then the extra code points in the longer of the two are ignored,
with a warning.
If code points in a given
pattern are not unique,
last corresponding replacement code point is used.
Returns a character vector.