Modify the InnerBlocks ‘Add block’ block appender label

After more digging I see how the core blocks do it now. It only works if there is ONE block type allowed as a child block, which isn’t useful in my case.

https://github.com/WordPress/gutenberg/blob/trunk/packages/block-editor/src/components/button-block-appender/index.js#L37-L42

So, it looks like this is not possible right now unless you define your own custom appender.

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