Some keybindings missing text hint

After clicking in a keybinding to change it, in the lower left corner a hint is displayed telling you to press a key to bind the option you clicked.

Some of the options are display a !!Missing!! text hint:

http://imageshack.us/photo/my-images/853/bindingsmissingstring.jpg/

The following options are the ones I've found that have such a problem:


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