A user on de.wp reports a problem with the thanks confirmation on a history page or a diff view.
Steps done by the user:
* Click thanks on an edit
* Click "No" in the confirmation
* The "thanks" is shown, but the confirmation sentence is still show, where you can click "no" again and so on
In german it shows like this
>„dankenDankeschön für diese Bearbeitung senden (stets öffentlich)? Ja Nein“
The first "danken" is the normal link to start thanks the rest is the confirmation sentence.
The user is using a safari (no version information).
Another user has the problem on Safari 7.1.7.
A third user reports problems with an IE9
https://de.wikipedia.org/w/index.php?title=Wikipedia:Technik/Werkstatt&oldid=147556178#Safari_und_Danken-Funktion
https://de.wikipedia.org/w/index.php?title=Wikipedia:Administratoren/Anfragen&oldid=146988190#.27danken.27_-Text