Fix typo; Refresh translation; Update zh-CN translation (#267)

* Fix typos found by codespell

* redotool: Mark description string as translatable

* Refresh translation; Update zh_CN translation again

src/config/uicoloreditor.cpp

@@ -136,7 +136,7 @@ void UIcolorEditor::initButtons() {
             this, &UIcolorEditor::changeLastButton);
     connect(m_buttonContrast, &CaptureButton::pressedButton,
             this, &UIcolorEditor::changeLastButton);
-    // clicking the labels chages the button too
+    // clicking the labels changes the button too
     connect(m_labelMain, &ClickableLabel::clicked,
             this, [this]{ changeLastButton(m_buttonMainColor); });
     connect(m_labelContrast, &ClickableLabel::clicked,

src/tools/capturetool.h

@@ -111,7 +111,7 @@ public:
 
     // revert changes
     virtual void undo(QPixmap &pixmap) = 0;
-    // Called everytime the tool has to draw
+    // Called every time the tool has to draw
     // recordUndo indicates when the tool should save the information
     // for the undo(), if the value is false calling undo() after
     // that process should not modify revert the changes.

src/tools/redo/redotool.cpp

@@ -39,7 +39,7 @@ QString RedoTool::nameID() {
 }
 
 QString RedoTool::description() const {
-    return "Redo the next modification";
+    return tr("Redo the next modification");
 }
 
 CaptureTool* RedoTool::copy(QObject *parent) {

src/widgets/capture/buttonhandler.cpp

@@ -112,7 +112,7 @@ void ButtonHandler::updatePosition(const QRect &selection) {
         elemsAtCorners -= elemCornersTop;
         int elemCornersBotton = qBound(0, elemsAtCorners, maxExtra);
 
-        // Add buttons at the botton of the seletion
+        // Add buttons at the button of the seletion
         if (!m_blockedBotton) {
             int addCounter = buttonsPerRow + elemCornersBotton;
             // Don't add more than we have