Fix spelling of 'unrecognised' to en_US version

[leonerd]

In my defence, I am British, so don't colour me an idiot please ;)

• This set of changes does not require a perldelta entry.

[karenetheridge]

Why did this need to be done? Was there a spell check test somewhere that failed?

As a non-US english speaker, I take umbrage at the obligation to conform.

[Grinnz]

To keep a consistent voice in our documentation: https://perldoc.perl.org/perldocstyle#Choice-of-language:-American-English

[Grinnz]

or in this case, our core warning messages, which has even broader effects.

[khwilliamson]

On 12/6/25 12:25, Grinnz wrote: *Grinnz* left a comment (Perl/perl5#23985) <https://github.com/Perl/ perl5/pull/23985#issuecomment-3620997042> To keep a consistent voice in our documentation: https:// perldoc.perl.org/perldocstyle#Choice-of-language:-American-English <https://perldoc.perl.org/perldocstyle#Choice-of-language:-American-English>

A good reason to standardize on a particular spelling form is to help non-native English speakers. Things that seem obvious to native speakers are often not so to others. That 'z' vs 's' difference doesn't change the meaning of this word in any dialect of English I am familiar with. But there are gobs of English words where a single changed letter changes things completely. I can't think of any offhand with s vs z, but it's likely there are. I can think of one in Spanish. 'casar' means to marry; 'cazar' means to hunt. I believe we have an obligation to our audience to do our best to communicate clearly. That involves standardizing on a particular idiom, which in this case by virtue of history happens to be American. This has nothing to do with one being better or more desirable than another.

[leonerd]

My thinking in this case was that while I was editing something else in perldiag.pod, I found there there were plenty of "unrecognized" messages but only a single "unrecognised", and that single odd one was a message I'd added recently, still experimental. So I felt it would be good to make them all conform to the same pattern.