We came across similar conundrum when trying to assign language/script to a photograph inscription in WMC and WD:

Will there be a CSV version for creating property in a wikibase or wikibase.cloud instance? Thank you!

Perfect. Thanks for the updates.

+1 for language code to conform syntax of language, script, region codes to BCP 47--script codes can be in 4-letter Alpha in sentence form or numeric; region codes in 2-letter ALPHA in capital letters.

I am appending to this ticket our WB search experience to this ticket, hoping it can be added to the list for troubleshooting? In my user preference, the default search is set to all available options. On Apr 22, I created a wiki page to documents project procedures, https://***.wikibase.si.edu/wiki/NASM_Archives_Airplanes. However, at the end of the day and following days, the only way to find the page is through <Contributions> link after signing in. <screenshot>

Has the date for century been raised and resolved?

Will you also ensure the deployment aligns with the syntax per W3C's BCP47, region code in CAP, script code titlecase, etc.? I have also reported this via the language list all Talk page, https://www.wikidata.org/wiki/Help_talk:Wikimedia_language_codes/lists/all. FYI.