We're not sure why the errors just link to mediawiki.org and a list of english error messages...
Why don't we have them in the extension, in i18n and translatable?
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Looks like they were added in T58492.
I guess the idea is that non-english users will encounter them, but when they tell someone having an error number saves the dev from grepping?
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Having the separate error link seems silly. I think they should be merged into the i18n message.
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The developers here are the people who wrote the OAuth client, so we don't necessarily want to expose them to MediaWiki code. I think @csteipp wanted to separate the error message for the user and the error message for the app developer? Although there are things on Help:OAuth/Errors that seem to be addressed to the user.
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Improved the help page a bit, in any case. I don't have a strong opinion on keeping it (it could easily be made translatable) vs. importing back into the extension code.