Update username error message to emphasize on 'reserved file extension'
What does this MR do and why?
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This is a follow-up from !70374 (diffs) which changes the error message for usernames to file extension types (previous: MIME types). This MR adjusts the messaging to a reserved file extension
from feedback on HackerNews, emphasizing on reserved
.
cc @bwill @dfrazao-gitlab @mkaeppler
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Edited by Michael Friedrich