Fix InputEventKey test failure under certain system languages

tests/test_main.cpp

@@ -363,6 +363,9 @@ struct GodotTestCaseListener : public doctest::IReporter {
 #ifdef TOOLS_ENABLED
 		if (EditorSettings::get_singleton()) {
 			EditorSettings::destroy();
+
+			// Instantiating the EditorSettings singleton sets the locale to the editor's language.
+			TranslationServer::get_singleton()->set_locale("en");
 		}
 #endif // TOOLS_ENABLED