Add plural formatting for error toast (#10756)

src/view/com/composer/Composer.tsx

@@ -210,7 +210,9 @@ function useAddImagesWithCap(
       if (result.status === 'full') {
         Toast.show(
           l({
-            message: `You can only add up to ${MAX_GALLERY_IMAGES} images per post`,
+            message: `You can only add up to ${plural(MAX_GALLERY_IMAGES, {
+              other: '# images',
+            })} per post`,
             comment:
               'Toast shown when the user tries to add more images but the post gallery is already at the cap',
           }),