1-File - New catalogue from POT file...

2-Choose wp-pro-quiz.pot

3-Set "Translation properties"

4-Save PO file - with the name "wp-pro-qioz-de_DE.po"

5-replace de_DE with your countries short code (e.g. en_US, nl_NL...)

6-Translate

7 - Save

Upload generated *.mo file to your server, to /wp-content/plugins/wp-pro-
quiz/languages