Backport of 
https://invent.kde.org/office/kbibtex/-/commit/4cad9a994ccd685e23a94bd13ced36f56336e056
to readd translations.

--- CMakeLists.txt.orig	2023-02-07 20:49:15 UTC
+++ CMakeLists.txt
@@ -252,6 +252,7 @@ add_subdirectory(
 )
 if(KF5DocTools_FOUND)
     add_subdirectory(doc)
+    kdoctools_install(po)
 endif()
 
 ki18n_install(po)
