Add tool tip for shape lock (#551)

* Add tool tip for shape lock

* tweak label & fix master rebase

Co-authored-by: David Luzar <luzar.david@gmail.com>

public/locales/en/translation.json

@@ -65,6 +65,7 @@
     "ellipse": "Ellipse",
     "arrow": "Arrow",
     "line": "Line",
-    "text": "Text"
+    "text": "Text",
+    "lock": "Keep selected tool active after drawing"
   }
 }

src/index.tsx

@@ -630,6 +630,7 @@ export class App extends React.Component<any, AppState> {
                         : this.state.elementType,
                     });
                   }}
+                  title={t("toolBar.lock")}
                 />
               </Stack.Row>
             </Stack.Col>