Rename id in metadata and desktop entry to org.goldendict.GoldenDict

https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html#tag-id-generic

https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#file-naming

goldendict.pro

@@ -186,9 +186,9 @@ unix:!mac {
     desktops.path = $$PREFIX/share/applications
     desktops.files = redist/*.desktop
     INSTALLS += desktops
-    appdata.path = $$PREFIX/share/metainfo
-    appdata.files = redist/*.appdata.xml
-    INSTALLS += appdata
+    metainfo.path = $$PREFIX/share/metainfo
+    metainfo.files = redist/*.metainfo.xml
+    INSTALLS += metainfo
     helps.path = $$PREFIX/share/goldendict/help/
     helps.files = help/*.qch
     INSTALLS += helps

mainwindow.cc

@@ -3396,7 +3396,7 @@ void MainWindow::setAutostart(bool autostart)
     return; // Nothing to do.
   if( autostart )
   {
-    const QString sourcePath = Config::getProgramDataDir() + "../applications/goldendict.desktop";
+    const QString sourcePath = Config::getProgramDataDir() + "../applications/org.goldendict.GoldenDict.desktop";
     QFile::copy( sourcePath, destinationPath );
   }
   else

redist/org.goldendict.GoldenDict.metainfo.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- Copyright 2019 Vitaly Zaitsev <vitaly@easycoding.org> -->
 <component type="desktop">
-  <id>org.goldendict.desktop</id>
+  <id>org.goldendict.GoldenDict</id>
   <metadata_license>CC0-1.0</metadata_license>
   <project_license>GPL-3.0-or-later</project_license>
   <name>GoldenDict</name>
@@ -34,6 +34,9 @@
   </screenshots>
   <url type="homepage">http://goldendict.org</url>
   <update_contact>https://github.com/goldendict/goldendict</update_contact>
-  <launchable type="desktop-id">goldendict.desktop</launchable>
+  <launchable type="desktop-id">org.goldendict.GoldenDict.desktop</launchable>
   <content_rating type="oars-1.0" />
+  <provides>
+    <id>org.goldendict.desktop</id>
+  </provides>
 </component>