This is a placeholder task for the proposal to extend the Translate extension to allow it to use annotations for translation region markup instead of inline <translate> and <!--T:1--> markup.

The discussion in T131516: Reduce or eliminate the need for the user to touch <translate> tags and unit markers is very related and this task should be seen as a concrete implementation proposal for T131516.

Also related:

• T171976: Invest in our future by researching a radically better multi-lingual content system (both reading and editing), compatible across all devices
• T143327: Make the Translate extension be based on DOM, not strings (although the annotations in this proposal are anchored in wikitext)
• T257233: Edit the translated page as a whole: "magic source code" (which I think is suggesting VisualEditor support for editing translated pages)