[6.x] Multisite improvements - entry vs global

[jaygeorge]

Description of the Problem

The global localization selector is often confused with a language selector, or the difference between the global site selection and page localization is confused.

I've experienced this myself and it's also mentioned here.

I think we can fix this with a few careful changes

What this PR Does

• Adds the word "Site" to the global localization selector so it's not confused with a language selector
• For the entry localization, make the language simpler: "Current Localization" -> "Working In"
• Add a localization icon to the entry localization too, so it's clear it's somewhat related to the site selector in the header

Few Localizations UI - Before

Few Localizations UI - After

Many Localizations UI - Before

Many Localizations UI - After

How to Reproduce

1. Go to a collection where localization is enabled e.g. enable it with /cp/collections/blog/edit
2. Try it with more than three localizations enabled, which triggers a combobox, and also two localizations enabled, which is a different UI