Gets rid of some code duplication.
IMO, more like time to fix that bug. :) In the worst-case scenario, you can override placeholderText here and provide a translated string.
However there is a deeper problem: now that System Settings uses a SearchField in its own toolbar, the Ctrl+F shortcut to trigger it becomes ambiguous. I guess we need to fix that too. However I see that this is already the case even without this patch, so there's no regression here at least.