FEATURE: 269332
Make Dolphin's Saved Search feature discoverable by adding a button next to the search field. The button only becomes visible when there is a valid search term. When pushed, it saves the search to the Places panel, providing a visible-by-default way to do this to complement the existing implementation that is only visible in the context menu.
Also harmonized the label text so that it's consistent no matter how you create a saved search (button or context menu)