What a case of sneaky reporting!
Let's dissect the sequence of events in detail:
- A Croatian girl learns German (enough to read books and watch movies).
- Her parents don't think she is very good. They are not German experts though.
- She goes in a coma, wakes up and speaks German but not Croatian.
- The hospital director makes a very generic declaration, e.g. "You never know when recovering from such a trauma how the brain will react."
- A psychiatric court expert is asked on his opinion and gives it freely, implying glossolalia and people speaking in tongues after coma.
- A new-found fluency in German is implied or claimed in the various articles -- of course though we will never possibly know whether she actually improved or not.
In all of this, the only one semi-claiming something supernatural is Dr. Mijo Milas at point five, speaking about a patient he's not reported as visiting.
Given that there is a well known syndrome that makes people speak with a different accent, or another that makes people not able to speak properly in a variety of ways, I do not find the events particularly surprising.
A much more balanced account has been given by ABC news
Though doctors say it's unlikely that the girl's German actually improved because of the coma, instances of lost language and bizarre changes in speech are more common than one may think.
ABC News asked neurologists and language experts to weigh in on these kinds of remarkable language phenomena.
One such rare but well-documented speech condition is known as Foreign Accent Syndrome. Those with this disorder will often be unable to speak after suffering a stroke or other brain trauma and when their voices return, they will sound as if they have a foreign accent.
Regarding the more general question of whether someone has ever been reported as learning a Biblical language after a coma - I haven't been able to find references. However, people do "speak in tongues" during religious activities. While they have claimed to be people speaking in Biblical languages, it has been proven to be glossolalia, a well studied (medical, non spiritual) phenomenon.
Newspaper articles to reconstruct the sequence above