This happened after I added two languages and worked on site for a while, suddenly Im not able to login anymore…
My default language has code “de”, and second one “en”
We are sorry for this bug. It is an issue in 3.5.2. We will release the patch release today. You can downgrade to 3.5.1 as workaround.
I removed error by deleting translations array inside languages/CODE.php
Yes, the source of the issue is there 
@hafizovic 3.5.3 patch released
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