[Bug fortran/79861] i18n: add translator comment for "%s !$ACC LOOP loops not perfectly nested at %L"

[fmarchal at perso dot be]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79861

Frederic Marchal <fmarchal at perso dot be> changed:

           What    |Removed                     |Added
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                 CC|                            |fmarchal at perso dot be

--- Comment #1 from Frederic Marchal <fmarchal at perso dot be> ---
%s can be replaced with the untranslated texts "tiled" or "collapsed".

That's not translator friendly and it introduces a discrepancy between the
messages where "tiled loop" or "collapsed loop" are translated (because they
appear verbatim) and those where they are not (due to the %s placeholder).

There are four such messages using the "clause" variable in
resolve_oacc_nested_loops() that need to be fixed.