[Feature] Adding translations to Optics workbench and using crowdin to manage them

[luzpaz]

@chbergmann We're trying to get popular workbenches translated and into crowdin

• https://github.com/FreeCAD/FreeCAD-addons/issues/187

Any interest in that ?

/cc @kaktusus & @hasecilu

[kaktusus]

If your workbench is ready for translation, we can help you handle translations on the Crowdin platform.

[chbergmann]

I can do that when I have time.

[hasecilu]

Check my PRs on Render and CfdOF WBs, there is implemented the translation support in the correct way.