Simplify CMake rules for desktop file translations.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 3788d0cdb1)

src/CMakeLists.txt

@@ -116,14 +116,9 @@ install(
 tde_create_translated_desktop(
     SOURCE kbibtex_part.desktop
     DESTINATION ${SERVICES_INSTALL_DIR}
-    PO_DIR ${CMAKE_SOURCE_DIR}/translations/desktop_files
 )
 
-tde_create_translated_desktop(
+tde_create_translated_desktop( ${PROJECT_NAME}.desktop )
-    SOURCE ${PROJECT_NAME}.desktop
-    DESTINATION ${XDG_APPS_INSTALL_DIR}
-    PO_DIR ${CMAKE_SOURCE_DIR}/translations/desktop_files
-)
 
 install(
     FILES kbibtex_part.rc