Internationalised colour lightener: Converts all colours found by a specified match in the source document which are also found in the map specified by the document on the lex port (see documentation below)

Maps dark colour names to lighter ones. Structure is like this:

...

Find a pale equivalent of the current colour, or the empty string, by looking it up in the lexicon supplied

We have a match -- build a suitable input to the add-attributes:attributes port

We take a language name and a match pattern from the command line

We construct the lexicon name from the language option