Upvote:1
I can't find an official English translation, but this web page from the Austrian government on Covid related travel restrictions answers your question:
(my translation)
When a person in one of the previously mentioned groups (Austrian, EU, EEA and Swiss citizens) enters Austria from all other states (which are not in the groups of states with a stable or instable Covid-19 situation), the person must either:
- present a negative PCR test, which is not older than 72 hours
- or quarantine for 10 days
The qurantine can be lifted following a negative PCR test.
The difference is that if you enter from a country with an instable Covid-19 situation, you must take a PCR test in Austria within 48 hours if you don't present a recent negative test at the border. If you come from other countries, the PCR test in Austria is voluntary.
I don't find any particular requirements for the foreign PCR tests or if the test result must be presented in a specific language.
Be aware that this is the current set of rules. Everything may have changed when you return from Tanzania at some point in the future.