Use the term "Annotations" everywhere in place of "Reviews"

BUG: 186797
FIXED-IN: 20.12.0

ui/side_reviews.cpp

@@ -98,7 +98,7 @@ Reviews::Reviews(QWidget *parent, Okular::Document *document)
 
     KTitleWidget *titleWidget = new KTitleWidget(this);
     titleWidget->setLevel(2);
-    titleWidget->setText(i18n("Reviews"));
+    titleWidget->setText(i18n("Annotations"));
 
     m_view = new TreeView(m_document, this);
     m_view->setAlternatingRowColors(true);