InitDefaultHelpFlag is not i18n aware

[decentral1se]

Follows #2301.

I have a bit of a situation where translation of long flags is desired but short flags is not.

If you have something like this in your CLI:

	rootCmd.PersistentFlags().BoolVarP(
		&internal.Help,
		i18n.G("help"),
		"h",  // not translated
		false,
		i18n.G("help for myCli"),
	)

And you translate "help" to "ayuda". Then in InitDefaultHelpFlag 👇

cobra/command.go

Line 1221 in 61968e8

if c.Flags().Lookup(helpFlagName) == nil {

helpFlagName is no longer "help" and the code attempts to set c.Flags().BoolP(helpFlagName, "h", false, usage). However, -h is already set and we see an explosion stacktrace:

panic: unable to redefine 'h' shorthand in "myCli" flagset: it's already used for "ayuda" flag

This is quite an edge-case but just another symptom of cobra not supporting i18n natively.

Just wanted to report that in.