5.15.2

[Angie-JA-Dou]

add qtbase Chinese Simple translations

[ossilator]

https://wiki.qt.io/Qt_Contribution_Guidelines

[xiaoyifang]

seems only *.zh_CN.ts should be included.

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
0 out of 4 committers have signed the CLA.

❌ Yaşar Çiv
❌ alcroito
❌ Angie-JA-Dou
❌ jaheikk

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