Misc. typos

Found via ` codespell -q 3 -S *.ts,*.xml -L ba,froms,seeked`

dialogs/advancedvideodialog.h

@@ -57,7 +57,7 @@ public:
 
 public slots:
   /**
-   * @brief Overrided accept for saving the UI data into the provided VideoCodecParams struct.
+   * @brief Overridden accept for saving the UI data into the provided VideoCodecParams struct.
    */
   virtual void accept() override;
 private:

dialogs/mediapropertiesdialog.h

@@ -84,7 +84,7 @@ private:
   QCheckBox* premultiply_alpha_setting;
 private slots:
   /**
-   * @brief Overrided accept function for saving the properties back to the Media class
+   * @brief Overridden accept function for saving the properties back to the Media class
    */
   void accept();
 };

dialogs/preferencesdialog.cpp

@@ -479,7 +479,7 @@ void PreferencesDialog::delete_all_previews() {
     delete_previews(1);
     QMessageBox::information(this,
                              tr("Previews Deleted"),
-                             tr("All previews deleted succesfully. You may have to re-open your current project for changes to take effect."),
+                             tr("All previews deleted successfully. You may have to re-open your current project for changes to take effect."),
                              QMessageBox::Ok);
   }
 }

dialogs/replaceclipmediadialog.h

@@ -51,7 +51,7 @@ public:
   ReplaceClipMediaDialog(QWidget* parent, Media* old_media);
 private slots:
   /**
-   * @brief Overrided accept for when the user clicks "Replace"
+   * @brief Overridden accept for when the user clicks "Replace"
    *
    * Checks whether the requested replace is valid using the following criteria:
    * * Any Media is selected

dialogs/speeddialog.h

@@ -33,7 +33,7 @@
  * A dialog for setting the speed of one or more Clips. This can be run from anywhere provided it's given a valid
  * array of Clips.
  *
- * It's preferable ot
+ * It's preferable to
  */
 class SpeedDialog : public QDialog
 {