Allow search bar name to be set in code

[EmmanuelMess]

The search bar name currently is not editable from code:

gz-gui/src/MainWindow.cc

Lines 125 to 152 in 72a1346

	QStringList pluginNames;
	auto plugins = App()->PluginList();
	for (auto const &path : plugins)
	{
	for (auto const &plugin : path.second)
	{
	// TODO(anyone): Move this into gz-plugin to be reusable
	// Remove shared library prefix and shared library suffix
	auto pluginName = plugin.substr(
	strlen(SHARED_LIBRARY_PREFIX),
	plugin.length() - strlen(SHARED_LIBRARY_PREFIX) -
	strlen(SHARED_LIBRARY_SUFFIX));
	// Split WWWCamelCase3D -> WWW Camel Case 3D
	std::regex reg("(\\B[A-Z][a-z])|(\\B[0-9])");
	pluginName = std::regex_replace(pluginName, reg, " $&");
	// Show?
	if (this->dataPtr->windowConfig.pluginsFromPaths ||
	std::find(this->dataPtr->windowConfig.showPlugins.begin(),
	this->dataPtr->windowConfig.showPlugins.end(),
	pluginName) !=
	this->dataPtr->windowConfig.showPlugins.end())
	{
	pluginNames.append(QString::fromStdString(pluginName));
	}
	}

The search bar name should be both translatable and not related to the file name.