Changed the icon of bookmarking action to a star

Also:

- Added tooltip for add/remove on reading list

resources/i18n/en.json

@@ -30,6 +30,8 @@
     "set-fullscreen":"Set fullscreen",
     "quit-fullscreen":"Quit fullScreen",
     "table-of-content":"Table of content",
+    "add-bookmark": "Add to the reading list",
+    "remove-bookmark": "Remove from the reading list",
     "reading-list":"Reading list",
     "reading-list-title":"Reading List",
     "zoom-in":"Zoom in",

resources/i18n/qqq.json

@@ -39,6 +39,8 @@
 	"videos": "{{identical|Video}}",
 	"yes": "{{identical|yes}}",
 	"no": "{{identical|no}}",
+	"add-bookmark": "Represents the action of adding a page as a bookmark",
+	"remove-bookmark": "Represents the action of removing a page from the bookmarks",
 	"open-link-in-web-browser": "Ouvrir le lien dans le navigateur",
 	"download-dir-dialog-msg": "Please note that <code><nowiki>{{DIRECTORY}}</nowiki></code> should be placed on a newline.",
 	"monitor-dir-dialog-title": "\"Monitor\" means \"watch\" in this context. The monitor directory is monitored/watched for new ZIM files.",

src/searchbar.cpp

@@ -24,9 +24,11 @@ void SearchButton::set_searchMode(bool searchMode)
     } else {
         auto kiwixApp = KiwixApp::instance();
         if (kiwixApp->isCurrentArticleBookmarked()) {
-            setIcon(QIcon(":/icons/reading-list-active.svg"));
+            setIcon(QIcon(":/icons/star.svg"));
+            setToolTip(gt("add-bookmark"));
         } else {
-            setIcon(QIcon(":/icons/reading-list.svg"));
+            setIcon(QIcon(":/icons/star-active.svg"));
+            setToolTip(gt("remove-bookmark"));
         }
         setIconSize(QSize(25, 25));
     }