About [[MediaWiki:Rollbacklinkcount/en]] and [[MediaWiki:Rollbacklinkcount-morethan/en]]
My ideas were:
"Rollback $1 edits of last editor" "Roll back $1 edits of last editor"
This should show that the $1 edits are the edits of the last editor. But I would be careful with changing the word "Rollback" because it is used some time now and a change of it could cause confusion.
I doubt that "roll back" would confuse anyone familiar with the "rollback" link (at least in English). It's the conventional verb form of exactly the same term (with an added space as the only spelling difference), so it's easily recognizable.
I'm not sure that the "of last editor" part is necessary, unless it's common for wikis to provide access to the function by default. (At the wikis with which I'm familiar, it's available strictly to sysops and other trusted editors, all of whom should understand its nature in advance.)
If such an addition is made, "by this user" would make more sense, as the message always appears alongside the relevant editor's name or IP address. (This also avoids the "edits"/"editor" redundancy.)
In summary, I believe that the two best options are as follows:
- "Roll back $1 edits"
- "Roll back $1 edits by this user"
The link does have a tooltip associated with it - Tooltip-rollback (“"Rollback" reverts the last contributor's edit(s) to this page in one click”).