update delete board modal to be more descriptive (#6690)

## Summary

<!--A description of the changes in this PR. Include the kind of change
(fix, feature, docs, etc), the "why" and the "how". Screenshots or
videos are useful for frontend changes.-->

## Related Issues / Discussions

<!--WHEN APPLICABLE: List any related issues or discussions on github or
discord. If this PR closes an issue, please use the "Closes #1234"
format, so that the issue will be automatically closed when the PR
merges.-->

## QA Instructions

<!--WHEN APPLICABLE: Describe how you have tested the changes in this
PR. Provide enough detail that a reviewer can reproduce your tests.-->

## Merge Plan

<!--WHEN APPLICABLE: Large PRs, or PRs that touch sensitive things like
DB schemas, may need some care when merging. For example, a careful
rebase by the change author, timing to not interfere with a pending
release, or a message to contributors on discord after merging.-->

## Checklist

- [ ] _The PR has a short but descriptive title, suitable for a
changelog_
- [ ] _Tests added / updated (if applicable)_
- [ ] _Documentation added / updated (if applicable)_

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

@@ -31,7 +31,8 @@
         "deleteBoard": "Delete Board",
         "deleteBoardAndImages": "Delete Board and Images",
         "deleteBoardOnly": "Delete Board Only",
-        "deletedBoardsCannotbeRestored": "Deleted boards cannot be restored",
+        "deletedBoardsCannotbeRestored": "Deleted boards cannot be restored. Selecting 'Delete Board Only' will move images to an uncategorized state.",
+        "deletedPrivateBoardsCannotbeRestored": "Deleted boards cannot be restored. Selecting 'Delete Board Only' will move images to a private uncategorized state for the image's creator.",
         "hideBoards": "Hide Boards",
         "loading": "Loading...",
         "menuItemAutoAdd": "Auto-add to this Board",

invokeai/frontend/web/src/features/gallery/components/Boards/DeleteBoardModal.tsx

@@ -120,7 +120,11 @@ const DeleteBoardModal = (props: Props) => {
                   bottomMessage={t('boards.bottomMessage')}
                 />
               )}
-              <Text>{t('boards.deletedBoardsCannotbeRestored')}</Text>
+              <Text>
+                {boardToDelete.is_private
+                  ? t('boards.deletedPrivateBoardsCannotbeRestored')
+                  : t('boards.deletedBoardsCannotbeRestored')}
+              </Text>
               <Text>
                 {canRestoreDeletedImagesFromBin ? t('gallery.deleteImageBin') : t('gallery.deleteImagePermanent')}
               </Text>