Adding pt_BR translations

Removing spinner after login attempt

Conflicts:
	converse.js

Allowing standard language code makes easier to backends to send it to
converse.js keeping coherence.

Conflicts:
	locale/locales.js

Update docs to not mention it

Conflicts:
	docs/doctrees/environment.pickle

We need it so that we can call initialize from the HTML template

- This is more user-friendly and we want it to be outside of the files bundled
  and minimized by require.js

Add Spanish translations

using span with css instead of img

using span instead of img to avoid problems with relative paths