I am currently working on an Ignition module thats will be sent to production. During development, I noticed that restarting the gateway service was the only way (I found) to reload a module’s resources and replace the labels in the configuration pages.
I found this topic that had the same issue I am having, but his solution only works in development and seems outdated because his solution no longer exists :
this.getApplication().getMarkupSettings().getMarkupCache().clear();
Note that the module will be heading to production and restarting the gateway for an eventual module update is not an option.