Add Ukrainian translations
Update Dutch translations
Update German translations
Sort translation strings by file instead

This variant keeps more context for the translators by having related
strings clumped together.
Add comments for translators where requested
Improve some error messages
Simplify log message as we always use TrueColour
Rework the error message in parameters.cxx

They were not very end user friendly so redo more or less all of them.
Reduce symbol scope of parameter helpers

There is no need for these to be global symbols as they are only
used in that file.
Merge branch 'translations' of https://github.com/CendioOssman/tigervnc