[Prototype] Add plugin install hook

[Bargs]

This is a prototype for a plugin install time hook that might be useful for the i18n plugin: #7545

Test it by installing the following example translation plugin:

management-es.zip

[hickeyma]

@Bargs Thanks for this.

I have tried it out and it produces the output ("Translation registered at...") when I run plugin install for the 'management' plugin.

It does not seem to be calling 'i18n.registerTranslations' however. I have put in some trace to make sure but not getting any output. Any ideas what I might be missing?

[Bargs]

@hickeyma I'm not using your implementation in my branch. For the sake of simplicity in demonstrating what I'm thinking, I just faked out the i18n plugin.

[hickeyma]

@Bargs Sure, understand that. I happened to hook in the actual i18n plugin but missed the mocked registration in the index of i18n module. Your feedback here fixed my issue. Thanks! :-)

[epixa]

@Bargs What's the status of this?

[Bargs]

No longer necessary