i18n error shown when attempting to rebuild normal deck

ftl/core/errors.ftl

@@ -2,3 +2,4 @@ errors-invalid-input-empty = Invalid input.
 errors-invalid-input-details = Invalid input: { $details }
 errors-parse-number-fail = A number was invalid or out of range.
 errors-filtered-parent-deck = Filtered decks can not have child decks.
+errors-filtered-deck-required = This action can only be used on a filtered deck.

rslib/src/decks/mod.rs

@@ -107,7 +107,7 @@ impl Deck {
         if let DeckKind::Filtered(filtered) = &self.kind {
             Ok(filtered)
         } else {
-            Err(AnkiError::invalid_input("deck not filtered"))
+            Err(FilteredDeckError::FilteredDeckRequired.into())
         }
     }
 
@@ -116,7 +116,7 @@ impl Deck {
         if let DeckKind::Filtered(filtered) = &mut self.kind {
             Ok(filtered)
         } else {
-            Err(AnkiError::invalid_input("deck not filtered"))
+            Err(FilteredDeckError::FilteredDeckRequired.into())
         }
     }
 

rslib/src/error/filtered.rs

@@ -10,6 +10,7 @@ pub enum FilteredDeckError {
     MustBeLeafNode,
     CanNotMoveCardsInto,
     SearchReturnedNoCards,
+    FilteredDeckRequired,
 }
 
 impl FilteredDeckError {
@@ -20,6 +21,7 @@ impl FilteredDeckError {
                 tr.browsing_cards_cant_be_manually_moved_into()
             }
             FilteredDeckError::SearchReturnedNoCards => tr.decks_filtered_deck_search_empty(),
+            FilteredDeckError::FilteredDeckRequired => tr.errors_filtered_deck_required(),
         }
         .into()
     }