[gfortran] Reworking some error messags for better internationalisation

[FX Coudert]

Attached patch reworks some error messages of the Fortran front-end so 
that they're not built up from pieces, but can be presented as a single 
sentence to the translater. With this patch, there will be only one 
remaining place where message are built from pieces (for future 
reference, this is the whynot variable in resolve_symbol(), in resolve.c).

The main part of this patch was regtested on i686-linux, I'm regtesting 
it in full. If this comes clean, I'll commit under the "obvious" rule in 
a few hours, unless someone spots a problem.

FX
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