I continue with problems. Certainly my config.json was with mistakes...
Now I pushed your fix but I continue with problems. I get this error:
Uncaught SyntaxError: Unexpected token o
If I change this line with "core" instead "local_myphoto" the things work but with no traslated strings.
I think there is some problem with the support for strings for contributed plugins or I don't know how to use it. I would like to see some contrib plugin (samples in docs are core) to see how is coded the strings support.