Fix(UI): Error message for extract region (#8759)

## Summary

This PR fixes misleading popup message "Canvas is empty" when attempting
to extract region with empty mask layer.
Replaced with correct message "Mask layer is empty". Also redirected few
other popups to use translation file.


## Checklist

- [x] _The PR has a short but descriptive title, suitable for a
changelog_
- [ ] _Tests added / updated (if applicable)_
- [ ] _❗Changes to a redux slice have a corresponding migration_
- [ ] _Documentation added / updated (if applicable)_
- [ ] _Updated `What's New` copy (if doing a release after this PR)_

Author: blessedcoolant

invokeai/frontend/web/public/locales/en.json

@@ -2185,6 +2185,9 @@
         "showHUD": "Show HUD",
         "rectangle": "Rectangle",
         "maskFill": "Mask Fill",
+        "maskLayerEmpty": "Mask layer is empty",
+        "extractMaskedAreaFailed": "Unable to extract masked area.",
+        "extractMaskedAreaMissingData": "Cannot extract: image or mask data is missing.",
         "addPositivePrompt": "Add $t(controlLayers.prompt)",
         "addNegativePrompt": "Add $t(controlLayers.negativePrompt)",
         "addReferenceImage": "Add $t(controlLayers.referenceImage)",

invokeai/frontend/web/src/features/controlLayers/components/InpaintMask/InpaintMaskMenuItemsExtractMaskedArea.tsx

@@ -27,7 +27,7 @@ export const InpaintMaskMenuItemsExtractMaskedArea = memo(() => {
       const maskAdapter = canvasManager.getAdapter(entityIdentifier);
       if (!maskAdapter) {
         log.error({ entityIdentifier }, 'Inpaint mask adapter not found when extracting masked area');
-        toast({ status: 'error', title: 'Unable to extract masked area.' });
+        toast({ status: 'error', title: t('controlLayers.extractMaskedAreaFailed') });
         return;
       }
 
@@ -44,7 +44,7 @@ export const InpaintMaskMenuItemsExtractMaskedArea = memo(() => {
 
         // Abort when the canvas is effectively empty—no pixels to extract.
         if (rect.width <= 0 || rect.height <= 0) {
-          toast({ status: 'warning', title: 'Canvas is empty.' });
+          toast({ status: 'warning', title: t('controlLayers.maskLayerEmpty') });
           return;
         }
 
@@ -74,15 +74,15 @@ export const InpaintMaskMenuItemsExtractMaskedArea = memo(() => {
             },
             'Mask and composite dimensions did not match when extracting masked area'
           );
-          toast({ status: 'error', title: 'Unable to extract masked area.' });
+          toast({ status: 'error', title: t('controlLayers.extractMaskedAreaFailed') });
           return;
         }
 
         const compositeArray = compositeImageData.data;
         const maskArray = maskImageData.data;
 
         if (!compositeArray || !maskArray) {
-          toast({ status: 'error', title: 'Cannot extract: image or mask data is missing.' });
+          toast({ status: 'error', title: t('controlLayers.extractMaskedAreaMissingData') });
           return;
         }
 
@@ -137,10 +137,10 @@ export const InpaintMaskMenuItemsExtractMaskedArea = memo(() => {
         });
       } catch (error) {
         log.error({ error: serializeError(error as Error) }, 'Failed to extract masked area to raster layer');
-        toast({ status: 'error', title: 'Unable to extract masked area.' });
+        toast({ status: 'error', title: t('controlLayers.extractMaskedAreaFailed') });
       }
     })();
-  }, [canvasManager, entityIdentifier]);
+  }, [canvasManager, entityIdentifier, t]);
 
   return (
     <MenuItem onClick={onExtract} icon={<PiSelectionBackgroundBold />} isDisabled={isBusy}>