The type of all text is the string. It is u8[], i.e. a dynamic array of 8-bit bytes, and always assumed to be utf-8.
var s = "hi äö"
Variables (and more complex terms) can be inserted into strings:
let i = 13
print("i has value {{i}}")
# => "i has value 13"
Some basic formatting options exists:
"bla{{pi|8.2}}"
# right-aligned, occupying 8 characters, with 2 digits after the decimal dot
# => "bla 3.12"