Change action message color from "darkgreen" to "dark green" as the
former does not exist on windows and results in debug log warnings.
Change the information color from "grey" to "dark grey" for improved
contrast with the white backgrounds. This may need to configurable
on systems where the HTML window has a dark background color.
Don't translate HTML formatting strings.
The GTK+ file dialog is case sensitive however it does support regular
expressions. Most of the file dialog wildcards are lower case so only
files with the lower case extensions will show up in the file dialog.
This code adds a method to convert file extensions of any case to the
appropriate (sch -> [sS][cC][hH]) regular expression on GTK+ builds so
all file extension case combinations will show up in the file dialog.
A note to developers: make sure to add a file extension when setting
when setting the default file argument. If you do don't set an
extension, the GTK+ file dialog will happily append the regular
expression as the file extension which is surely not what you want.
There are still a few known places (mostly gerbview) where there are
some complex wildcard code that has not been converted.
Fixes lp:1720542
https://bugs.launchpad.net/kicad/+bug/1720542