I just have installed PlaySMS 1.4.2 on a CentOS_7 + Nginx + PHP 7.2 + Mariadb 10.3 server.
I tuned some parameters according to Anton article about PlaySMS integration with PHP 7.
All seems Ok but I found a problem with language selection, I just have default language value available in the list either in General config or in User preferences.
Do you have an idea why?
Workaround, manually change the language_module inside the database.