The key which will be used to retrieve the customlabel value. A customlabel will be appended to the end of a config variable to get this key, with a space in between. For example, if a variable labelset=foo has been defined in the bondfrontend.conf and a button has <button customlabel="Bar" configvar="labelset"<, then the key will be "foo Bar".
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The value for any customlabel with the appropriate key.
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