I was required to install BloomBeta to make use of a book that uses cartoon images. I discovered that books are now displaying an older spelling of the vernacular language name. In Settings - Local language - Change, the correct spelling for the 3-letter abbreviation is shown in the list, but even after restart the old spelling persists in books (and is also shown in the main Settings window). This is not a problem in any release versions, but I observed it in 4.7.105 and current 4.7.106.
Thanks for using the beta and reporting this problem.
Will you please give us your book by going to Help -> Report a Problem? Be sure the checkbox is checked for “Include Book”.