#2 Introduced language module support

[Thomas Hergenhahn]

For the main program I moved the function which
provides
message strings for message IDs to a loadable module.
I also provided the possinbility to override the
standard
menubar/statusline creation functions from that
module.
The module lang_gr.cc now contains the GERMAN text.
The
FRENCH module, lang_fr.cc contains english texts
mixed
with some rubbish, because I do not speak french.
Somebody else might fix this.