Small optimizations for cmake (#611)

* Avoid redundant branch for the condition Linux and Filesystem Hierarchy Standard

* Put translations back to own directory on MacOS

CMakeLists.txt

@@ -96,10 +96,11 @@ target_link_libraries(
 
 if(LINUX)
     OPTION(TREESHEETS_RELOCATABLE_INSTALLATION "Install data relative to the treesheets binary, instead of respecting the Filesystem Hierarchy Standard" OFF)
-    include(GNUInstallDirs)
 endif()
 
 if(LINUX AND NOT TREESHEETS_RELOCATABLE_INSTALLATION)
+    include(GNUInstallDirs)
+
     set(TREESHEETS_BINDIR ${CMAKE_INSTALL_BINDIR})
     set(TREESHEETS_DOCDIR ${CMAKE_INSTALL_DOCDIR})
     set(TREESHEETS_FULL_DOCDIR ${CMAKE_INSTALL_FULL_DOCDIR})
@@ -110,6 +111,10 @@ if(LINUX AND NOT TREESHEETS_RELOCATABLE_INSTALLATION)
     target_compile_definitions(treesheets PRIVATE "LOCALEDIR=L\"${CMAKE_INSTALL_FULL_LOCALEDIR}\"")
     target_compile_definitions(treesheets PRIVATE "TREESHEETS_DOCDIR=\"${TREESHEETS_FULL_DOCDIR}\"")
     target_compile_definitions(treesheets PRIVATE "TREESHEETS_DATADIR=\"${TREESHEETS_FULL_PKGDATADIR}\"")
+
+    install(FILES linux/com.strlen.TreeSheets.svg DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/scalable/apps)
+    install(FILES linux/com.strlen.TreeSheets.desktop DESTINATION ${CMAKE_INSTALL_DATADIR}/applications)
+    install(FILES linux/com.strlen.TreeSheets.xml DESTINATION ${CMAKE_INSTALL_DATADIR}/mime/packages)
 else()
     set(TREESHEETS_BINDIR ${CMAKE_INSTALL_PREFIX})
     set(TREESHEETS_DOCDIR ${CMAKE_INSTALL_PREFIX})
@@ -147,7 +152,7 @@ elseif(APPLE)
     foreach(locale ${locales})
         install(
             FILES "TS/translations/${locale}/ts.mo"
-            DESTINATION "${CMAKE_INSTALL_PREFIX}/${locale}.lproj"
+            DESTINATION "${CMAKE_INSTALL_PREFIX}/translations/${locale}.lproj"
         )
     endforeach()
 else()
@@ -159,9 +164,3 @@ else()
         )
     endforeach()
 endif()
-
-if(LINUX AND NOT TREESHEETS_RELOCATABLE_INSTALLATION)
-    install(FILES linux/com.strlen.TreeSheets.svg DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/scalable/apps)
-    install(FILES linux/com.strlen.TreeSheets.desktop DESTINATION ${CMAKE_INSTALL_DATADIR}/applications)
-    install(FILES linux/com.strlen.TreeSheets.xml DESTINATION ${CMAKE_INSTALL_DATADIR}/mime/packages)
-endif()