In my previous answer was not only irony, but also many years of experience ...
The fact is that if you are developing some kind of plugin or tool, first of all you should think about the timeliness of its development. Most of the custom tools are valuable exact now, not tomorrow or when they are finally brought to perfection.
Make THE THING first, and then "tie the bright ribbons to it, glue the charming little beads and wrap it beautifully" ...
If your clients speak a language other than English, then come up with English titles for user interface controls so that they are understandable to everyone. But tooltips, for example, you can do in the language of your client, and, of course, do the documentation in that language.
