- Avoid the term "cannot", since that sounds like Blender is unable to
perform the renaming.
- Sequencer names can be modified, just not from the Outliner. Note that
in the warning.
- Don't use the term "please". We don't add this usually as it's
unnecessary and can come across demanding.
- The term "master collection" is not used in the UI, should be "scene
collection". But the warning didn't add much info, so simply give it
the same generic warning like other such grouping items.
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