Left panel "Search" has 2 buttons: "Go" and "Search". Name of the panel is
"Search" as noun, caption of the button is "Search" as verb. In some languages
it is not same words, but now we have only one interface message for them, it's
[[MediaWiki:Search]].
So we need new message, something like [[MediaWiki:Searchbutton]].
Version: unspecified
Severity: trivial