When Using the US and the British English packages within a same instance of Confluence, the following points have been noticed:

1) In the Administration screen, while setting the Global Default language, the languages are listed with their respective flags, but the text remains the same i.e. "English". This should be changed to highlight "US English" and "British English". A screenshot has been attached.

2) In the "General Preferences" screen, for each individual user, the drop down list with the available language packs, does not have a clear distinction between US and British English. The Text is "English" for both the cases. Moreover the text specifying the current selection is also not clear with the text being "Site Default (English)". This should be again more specific to the type of English package being used. A screenshot has been attached.