When you refer to the used translation files you refer to the root (or default) translation file. You create an additional file for each language, that you want to handle like below:

(Please notice the fixed naming of each file and language below).

As you can see the specific languages need to be included in the file name as shown above. You can use the Locale style to see all possible values for the languages. If you refer to a language, that is not listed, then the default/root file (here: translate.properties) file is used. Also if you refer to a key value not found in the specific language, then the value from the default file is used (if found).

More information of the use of translation tables can be found for the text element.