Language dialog in UI applications

Good day. Could you please add a dialog where users can select language.
We need it in admin, task, idm and may be in modeler applications.
After that i we can contribute for internationalization. In addition, i can provide text in russian, german languages.
I already have seen that applications have en.json file. But we want to switch to another languages.
I suggest to add english, russian, german languages.
I hope you can add this cool feature.