Misc. typos

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

ui/effectui.cpp

@@ -153,7 +153,7 @@ void EffectUI::AddAdditionalEffect(Effect *e)
   // Ensure this is the same kind of effect and will be fully compatible
   Q_ASSERT(e->meta == effect_->meta);
 
-  // Add multiple modifer to header label (but only once)
+  // Add 'multiple' modifier to header label (but only once)
   if (additional_effects_.isEmpty()) {
     QString new_title = tr("%1 (multiple)").arg(Title());
 

ui/effectui.h

@@ -48,7 +48,7 @@ public:
    *
    * @return
    *
-   * The Effect object passed to the constrcutor whe creating this EffectUI.
+   * The Effect object passed to the constructor when creating this EffectUI.
    */
   Effect* GetEffect();
 

ui/labelslider.h

@@ -82,7 +82,7 @@ public:
    * * `LABELSLIDER_FRAMENUMBER` - Shows the number as a timecode according to `config.timecode_view`. By default,
    * will render hh:mm:ss:ff
    * * `LABELSLIDER_PERCENT` - Shows the number as a percentage. 1.0 becomes "100%", 0.5 becomes 50%, etc.
-   * * `LABELSLIDER_DECIBLE` - Shows the number as a decibel. 1.0 becomes "0 dB", 2.0 becames roughly "6 dB", 0.5
+   * * `LABELSLIDER_DECIBLE` - Shows the number as a decibel. 1.0 becomes "0 dB", 2.0 becomes roughly "6 dB", 0.5
    * becomes roughly "-6 dB", etc.
    *
    * @param type

ui/timelinewidget.cpp

@@ -2093,7 +2093,7 @@ void TimelineWidget::mouseMoveEvent(QMouseEvent *event) {
               if (!(link->track() >= minimum_selection_track
                     && link->track() <= maximum_selection_track)) {
 
-                // clip is not in selectin area, time to select it
+                // clip is not in selection area, time to select it
                 Selection link_sel;
                 link_sel.in = selection_in;
                 link_sel.out = selection_out;