For World Publishing Tools have a look here: Custom Plugins, Scripts and Solutions for Adobe InDesign | in-tools.com
When you are a cloud subscriber you can download any other language version of the programs without additional cost. With InDesign these versions will install their additional plugins into the same program which results in additional functionality in every used language. InDesign starts with the language of the OS if installed, if not it chooses one version which is available according the preferences of the OS.
Photoshop has a different way, there you can choose the program language in the Preferences > User Interface, it will change upon the next program start.