`&spelllang` can be a list of multiple languages. Support that by matching the language at the start, the end and/or between commas, instead of comparing the value, and then appending to `l:ignore_chars` for every matched language.
`&spelllang` can be a list of multiple languages. Support that by matching the language at the start, the end and/or between commas, instead of comparing the value, and then appending to `l:ignore_chars` for every matched language.