MaterialTitle replace with TextMixin#setText

Author: kevzlou7979

gwt-material/src/main/java/gwt/material/design/client/ui/MaterialCollection.java

@@ -145,7 +145,7 @@ public void clearActive() {
      * Sets the header of the collection component.
      */
     public void setHeader(String header) {
-        headerLabel.getElement().setInnerSafeHtml(SafeHtmlUtils.fromString(header));
+        headerLabel.setText(header);
         addStyleName(CssName.WITH_HEADER);
         ListItem item = new ListItem(headerLabel);
         UiHelper.addMousePressedHandlers(item);

gwt-material/src/main/java/gwt/material/design/client/ui/MaterialTitle.java

@@ -106,12 +106,12 @@ public Paragraph getParagraph() {
 
     @Override
     public void setValue(String value, boolean fireEvents) {
-        header.getElement().setInnerSafeHtml(SafeHtmlUtils.fromString(value));
+        header.setText(value);
         super.setValue(value, fireEvents);
     }
 
     @Override
     public String getValue() {
-        return SafeHtmlUtils.fromString(header.getElement().getInnerHTML()).asString();
+        return header.getText();
     }
 }