[5.4] Several modifications to the json localization approach

[themsaid]

Added support for keyed replacements:

__('Hello :name, you have :unread messages.', ['name' => 'David', 'unread' => 123])

And also the method now preserves key order between different locales, for example:

// In en/*.php
['to :name I give :greeting' => ':greeting :name']

__("to :name I give :greeting", ['David', 'Greetings'])

This will print Greetings David when the locale is en, and to David I give Greetings if the locale is yoda.

[taylorotwell]

I just got rid of makeJsonReplacements and used makeReplacements instead. This means you have to pass keys, which I think is honestly a pretty good habit and makeReplacements also handles some capitalization stuff.