Fix typos and spelling

src/core/commandlineoptions.cpp

@@ -167,8 +167,8 @@ bool CommandlineOptions::Parse() {
                 .arg(tr("Skip backwards in playlist"),
                      tr("Skip forwards in playlist"),
                      tr("Set the volume to <value> percent"),
-                     tr("Increase the volume by 4 precent"),
-                     tr("Decrease the volume by 4 precent"),
+                     tr("Increase the volume by 4 percent"),
+                     tr("Decrease the volume by 4 percent"),
                      tr("Increase the volume by <value> percent"),
                      tr("Decrease the volume by <value> percent"))
                 .arg(tr("Seek the currently playing track to an absolute position"),

src/core/mainwindow.cpp

@@ -741,7 +741,7 @@ MainWindow::MainWindow(Application *app, SystemTrayIcon *tray_icon, OSD *osd, co
 
   // Load theme
   // This is tricky: we need to save the default/system palette now,
-  // before loading user preferred theme (which will overide it), to be able to restore it later
+  // before loading user preferred theme (which will override it), to be able to restore it later
   const_cast<QPalette&>(Appearance::kDefaultPalette) = QApplication::palette();
   app_->appearance()->LoadUserTheme();
   StyleSheetLoader *css_loader = new StyleSheetLoader(this);

src/core/systemtrayicon.h

@@ -46,7 +46,7 @@ class SystemTrayIcon : public QObject {
 
   // Called by the OSD
   virtual void ShowPopup(const QString &summary, const QString &message, int timeout) {}
-  // If this get's invoked with image_path equal to nullptr, the tooltip should still be shown - just without the cover art.
+  // If this gets invoked with image_path equal to nullptr, the tooltip should still be shown - just without the cover art.
   virtual void SetNowPlaying(const Song &song, const QUrl &cover_url) {}
   virtual void ClearNowPlaying() {}