Removing french in listing

This issue was created automatically from an original CUE issue. Further discussion may take place here.

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The goal of this feature is to cleanup the code by removing all the listing that is in french.
We'll keep handling steering file in french and input/output variables in the serafin files.

Mainly it will be transforming lines like the one below:
@if(lng.eq.1) write(lu,) francais
if(lng.eq.2) write(ly,) english@
into
@write(lu,*) english@

I added a parameter that defines the language in declarations special
LNG_FR for french and LNG_EN for english.

This removes around 11 000 lines.

The work is done i still have validation to run through.