Provide strfmon function for platforms that don't have it
Bug 695240 - mortgage wizard empty table
Bug 711567 - Cannot save a custom report if a path contain diacritic chars
Swap static functions so the lower one can reuse the upper one
Rewrite gfec_eval_file to avoid opening the file itself in guile

This is a continuation of
Bug 711567 - Cannot save a custom report if a path contain diacritic chars
However this commit deals with reading the file
Update Dutch translation, copied from the Translation Project.