(1) The following strings need to be preceded by a comment line explaining what the parameter is. For "Load next" we need to provide full string in the Bundle or explain in comment what it is followed with.

localhistory/src/org/netbeans/modules/localhistory/ui/view/Bundle.properties

CTL_LocalHistoryTopComponent={0} [Local History]
LBL_Today=Today {0}
LBL_Yesterday=Yesterday {0}
LBL_LoadNext=Load next
LBL_FromVCS=from {0}
LBL_LoadingFrom=Loading history from {0} ...

(2) The following strings and the UI of the options panel need to be changed:

versioning.ui/src/org/netbeans/modules/versioning/ui/options/Bundle.properties

HistoryOptionsPanel.removeOlderRadioButton.text=&Remove Local History files older than
HistoryOptionsPanel.loadIncrementsRadioButton.text=&Increments for loading revisions:
HistoryOptionsPanel.jLabel4.text=days

to e.g. following:

&Remove Local History files older than (number of days): [ 7 ]
&Increments for loading revisions (number of days): [ 30 ]