Sort features on generation page by label rather than machine name

Problem/Motivation

Features on the feature export form are sorted by key rather than label, which leads to unexpected ordering,

Current sample ordering:

Article (article)
Default comments (comment)
Core (core)
Basic page (page)
Site (site)
User (user)

Expected sample ordering:

Article (article)
Basic page (page)
Core (core)
Default comments (comment)
Site (site)
User (user)

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes