Fix Sprite drag and drop hint mentions invalid option with root node selected

[nongvantinh]

Fixes #69219

Fix the incorrect hint when dragging and dropping assets into the scene while the root node is selected.

[RedMser]

This breaks translation, I believe you need to include the TTR calls to each line that includes a part of the string.

[nongvantinh]

I was not familiar with TTR; thanks for the suggestion and explanations.

[akien-mga]

Looks good! Could you squash the commits? See PR workflow for instructions.

[akien-mga]

Sorry for only noticing it now, could you also amend the commit message to be more explicit? The current commit doesn't really give much context so it's hard to make sense of taken individually. What I used to change the PR title could be a good description for the commit too.

[coppolaemilio]

@akien-mga Tested and ready to merge 👍

[akien-mga]

Thanks!

[angstyloop]

https://gist.github.com/angstyloop/08200c6d816347c82ea1aed56c219f17