Merge pull request #3221 from nirvn/bookmark_ui_imp

[bookmarks] improve zoom to bookmark icon and UI

Author: nyalldawson

images/images.qrc

@@ -404,6 +404,7 @@
         <file>themes/default/mActionZoomLast.svg</file>
         <file>themes/default/mActionZoomNext.svg</file>
         <file>themes/default/mActionZoomOut.svg</file>
+        <file>themes/default/mActionZoomToBookmark.svg</file>
         <file>themes/default/mActionZoomToLayer.svg</file>
         <file>themes/default/mActionZoomToSelected.svg</file>
         <file>themes/default/mActionFilterTableFields.svg</file>