Further spelling fixes in translatable strings

Further spelling fixes in translatable strings

This addresses the non-Oxford British English vs. US English spelling
nits in translatable strings.

I see various similar cases in m2 and rust FEs where they don't make it into
gcc.pot, guess those would be nice to get fixed too.

2024-04-23  Jakub Jelinek  <jakub@redhat.com>

	* config/darwin.opt (init): Spelling fix: initialiser -> initializer.
gcc/c-family/
	* c-attribs.cc (handle_objc_nullability_attribute): Spelling fix:
	recognised -> recognized.
gcc/m2/
	* lang.opt (fdef=, fmod=): Spelling fix: recognise -> recognize.