Right click on a data column in a Grid shows up a context menu for Adding a new value, delete the current one or edit it. There's a FIXME comment suggesting to add the name of the column to be edited, for instance, "Edit 'Key'" instead of just simply "Edit", as it may be more clear what it does.
Created attachment 207253 [details] Patch
I added the literal "Edit “%s”" directly to Source/WebCore/English.lproj/localizedStrings.js. I don't know if there's any tool to do that automatically. Apparently update-webkit-localizable-strings only works with the new web inspector.
Comment on attachment 207253 [details] Patch Clearing flags on attachment: 207253 Committed r152985: <http://trac.webkit.org/changeset/152985>
All reviewed patches have been landed. Closing bug.