Userland: Set Button text using the new String class

Author: https://github.com/krkk
Commit: e39adc4772
Pull-request: https://github.com/SerenityOS/serenity/pull/17454
Reviewed-by: https://github.com/linusg ✅

Userland/DevTools/HackStudio/FindInFilesWidget.cpp

@@ -122,7 +122,7 @@ FindInFilesWidget::FindInFilesWidget()
 
     m_textbox = top_container.add<GUI::TextBox>();
 
-    m_button = top_container.add<GUI::Button>("Find in files");
+    m_button = top_container.add<GUI::Button>(String::from_utf8("Find in files"sv).release_value_but_fixme_should_propagate_errors());
     m_button->set_fixed_width(100);
 
     m_result_view = add<GUI::TableView>();