merge with main git using update-weblate-git.
wiki/src/news/version_3.15.ar.po: updating as wiki/src/news/version_3.15.de.po has changed. wiki/src/news/version_3.15.ca.po: updating as wiki/src/news/version_3.15.de.po has changed. wiki/src/news/version_3.15.id.po: updating as wiki/src/news/version_3.15.de.po has changed. wiki/src/news/version_3.15.pl.po: updating as wiki/src/news/version_3.15.de.po has changed. wiki/src/news/version_3.15.ru.po: updating as wiki/src/news/version_3.15.de.po has changed. wiki/src/news/version_3.15.sr_Latn.po: updating as wiki/src/news/version_3.15.de.po has changed. wiki/src/news/version_3.15.tr.po: updating as wiki/src/news/version_3.15.de.po has changed. wiki/src/news/version_3.15.zh.po: updating as wiki/src/news/version_3.15.de.po has changed. wiki/src/news/version_3.15.zh_TW.po: updating as wiki/src/news/version_3.15.de.po has changed.