[wwwdocs, patch] Update Fortran part of gcc-5/changes.html

[Tobias Burnus]

Hi all, hi Gerald,

sync the changes from https://gcc.gnu.org/wiki/GFortran/News#GCC5 for the
today's added compatibilty section and Janne's locale addition.

If there are no objects or comments, I will commit it this evening

Tobias,
who is really behind reading fortran@gcc emails.
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