Problem/Motivation
Initially this issue was about changing the label of the contextual (delete) link to match the label in block-layout (remove). In fact the link in contextual links actually deletes the block and all of it's instanaces. This is too destructive an action to expose in a contextual link, since users are likely to think they are only removing a single instance when they are in fact removing all instances and any associated content.
Proposed resolution
Remove the 'delete' contextual link from blocks.
Remaining tasks
Create patch
User interface changes
There will be no 'delete' link on blocks.
API changes
?
Data model changes
?