I hacked Q2A core so that user could choose language freely. If language was chosen by account page, parts of page are displayed in specified language. Our main navigation is in the left side bar. Below pictures are sample of each language. When V1.5 language files was applied to Q2A V1.6dev, error displayed with some languages. Those languages were excepted.
As reference information of 1.6 released soon ...
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April 20, 2021: Q2A 1.8.6 released!