XWIKI-18799: Replace "---" filter suggestion with "(empty)" in Live Data tables

(cherry picked from commit a9d0f9e0)

xwiki-platform-core/xwiki-platform-livedata/xwiki-platform-livedata-macro/src/main/resources/ApplicationResources.properties

@@ -116,7 +116,7 @@ livedata.displayer.boolean.false=False
 livedata.displayer.xObjectProperty.missingDocumentName.errorMessage=Can't save an XObject property with a missing document name.
 livedata.displayer.xObjectProperty.failedToRetrieveField.errorMessage=Failed to retrieve the {0} field.
 
-livedata.filter.list.emptyLabel=---
+livedata.filter.list.emptyLabel=(empty)
 
 livedata.footnotes.computedTitle=Some pages have a computed title. Filtering and sorting by title will not work as expected for these pages.
 livedata.footnotes.propertyNotViewable=Displayed when some entries require special rights to be viewed and thus fields cannot be extracted from them.