I assume you tried changing the Desktop Language like below and creating the extract (I don't think that changes much... just labels mostly so this is probably not what you are after )
I found some resources that may help you. FYI they are not Hana specific.
You may have read these already but just in case ….
Best way to import and apply language translations of values? Aliases? This one had a workaround which was not ideal but maybe useful
The below link is a little old and has some broken links but still has useful information
And lastly this person below is asking for feedback and may be worth pinging
Thanks Monica for your suggestions.. I had tried that (changing the Tableau Locale) with no success
It really seems to be how to set the locale settings from the HANA connection in Tableau.
As an example, in the SAP BW Tableau Connector, there's the Language Setting.
Wish that same functionality would be available on the SAP HANA Tableau Connector.
We had the same problem you are facing when connecting on a SAP HANA view generated from a SAP-BW query, where attributes have both a key and a text value. The text value would not display at all, because the user connected by default in English to the HANA view, while the text information of the attribute was only filled in french. In our configuration, we did find the solution on the HANA database user properties side, and not on the Tableau side. In HANA Studio, we defined a new User Parameter with the following settings ("fr" for french, if you want English then "en"):
Beware of the case sensitiveness of both Parameter and Value, if you enter "FR" instead of "fr" as value, it will not work.
Hope this helps.