Some of the strings that are used in the "Micro" screen are being translated in another repo

[jbphet]

The code for the "Micro" screen was moved into this repo from molecules-and-light. The strings were moved at the same time, but as of this writing, translations of those strings are being saved in babel/molecules-and-light. This is because the translation utility works with the current published version of the sim, not the master version. When we restart the work on the "Micro" screen, we should probably move the strings. This will involve republishing the Molecules and Light sim from master.

There is a corresponding issue in the molecules-and-light repo, see phetsims/molecules-and-light#382.

[jbphet]

Deferring until we start working on the "Micro" screen.